The ecliptic and the sidereal motion of the sun Moon and the planets on it.

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "The ecliptic and the sidereal motion of the sun Moon and the planets on it."

Transcription

1 The ecliptic and the sidereal motion of the sun Moon and the planets on it. The following picture is a picture of the sky as it looks about noon on May The light of the Sun has been erased artificially via software. For that figure a commercially available planetarium program has been used. We also can see that Jupiter Venus and Mercury are close to the Sun. However we see that we can mentally connect the Sun and the three planets along a line (circle since we are on the celestial sphere). This mental line is called the ecliptic and it is a large circle on the celestial sphere. The ecliptic is passing from the 12 constellations of the zodiac. If you mentally draw the ecliptic you can see that it crosses Pisces, Aries, Taurus and Gemini from West to East. You can see that currently the Sun is entering Taurus, Mercury is in Aries and Venus is about to exit Taurus. In the figure I also show you the Stars Pleiades.

2 Now I will show you the same picture of the sky on May 30, 2012 as seen from Tampa once more at noon. The Sunlight has been erased via software. The constellation look the same, the planets and the Sun still lie on the same line the ecliptic. The ecliptic circle is always the same on the celestial sphere. However the Sun (and the planets) are not on their original place on the ecliptic line compared with the constellations. Observe that the Sun is now more to the left compared with the constellations of the Zodiac and the Pleiades. Since when I look at the Sun I am looking South the Sun is more to the East with respect to the fixed Stars 15 days later than my original photo of the sky. Now I will show you the same picture of the sky on June 16, 2012 as seen from Tampa once more at noon. The Sunlight has been erased via software.

3 The constellation look the same, the planets and the Sun still lie on the same line the ecliptic. The ecliptic circle is always the same on the celestial sphere. However the Sun (and the planets) are not on their original place on the ecliptic line compared with the constellations. Observe that the Sun is now exiting Taurus and about to enter Gemini. It always moves Eastwards with respect to the stars. The same for Jupiter and Mercury, but Venus happens now to be retrograde. It has shifted Westwards (which is not the usual motion) along the ecliptic with respect to the stars. Sometimes planets appear to be retrograde. All stars, the Sun, the Moon and the planets move from Eats to West (left to right in the Northern Hemisphere) due to the spin of the earth. This is the daily motion. However the Sun appears to be slower that the fixed stars and it is always left behind (to the East) with respect to them. The Sun is actually left behind one degree per day and one year later it will be in its original position with respect to the constellations having traversed all the points of the ecliptic. In antiquity the belief was that there are more than one celestial sphere each for every planet and a different deity was also residing in them. Today we know that this East-wise shift or slowing of the Sun along the ecliptic and the fixed stars is because of parallax, that is the change of the Earth -- Sun line of view as the Earth rotates around

4 the Sun. As the Earth rotates around the Sun that change of line of view aligns the Sun with different constellations and generates a picture of the celestial sphere where the Sun wanders around the ecliptic line. This is the annual motion of the Sun along the ecliptic and this motion is relative to the stars. This is a kind of backward motion from West to East. The Sun the Moon and the planets therefore as viewed from Earth they participate to two motions simultaneously. The daily motion due to the spin of the earth and they appear to make a full circle from East to West in 24 hours and the motion along the ecliptic relative to the other stars from West to East (backwards). That motion along the ecliptic is different for each planet, the sun and the Moon. For the Sun it takes a year to complete the ecliptic circle, for the moon one month and it is different for each planet. Planets some time appear to move along the ecliptic from east to west when they are retrograde. The Sun and Moon are never retrograde. It takes the Moon one month to traverse all the points of the ecliptic and all the constellations of the Zodiac. The shift of the moon along the ecliptic is also always East ward (like the Sun s although 12 times faster). This is how the phases of the Moon are formed. When the Moon and the Sun are together on the ecliptic it is New Moon. When the Moon has shifted 90 degrees eastward from the sun on the ecliptic it is first quarter moon, when 180 degrees full Moon, when 270 degrees third quarter Moon. Less than 90 degrees (before first quarter) waxing crescent, after first quarter and before full moon (between 90 and 180 degrees) waxing gibbous, after full moon and before third quarter (between 180 and 270 degrees) waning gibbous and after third quarter and before new moon (between 270 and 360 full circle) waning crescent. It goes: New Moon Waxing Crescent First quarter Waxing Gibbous Full Moon Waning Gibbous Third Quarter Waning Crescent New Moon. The corresponding East-wise angular distance from the Sun along the ecliptic circle on the celestial sphere is: 0 degrees less than less than less than less than or together with the Sun again The above relative position of the Sun and the Moon can help us find out what time the Moon rises or sets when it is at a particular phase. Example: Assume that we have a third quarter Moon? What time does such a Moon rise or set? We have third quarter of the Moon when the Moon is 270 degrees Eastwards from the sun along the ecliptic. It is the same as the Moon being 90 degrees westward along the ecliptic because the circle has 360 degrees. It is also the same as the Sun being 90 degrees

5 Eastward from the Moon along the ecliptic. When such a moon is rising at the East the Sun is 90 degrees eastward, that is it has not risen yet, it will rise 90 degrees later that is 6 hours later because it takes 24 hours for the whole ecliptic circle to rise. Therefore it must be midnight. What time doe such a moon (third quarter) set? When such a Moon set the sun is 90 degrees eastward that is at the zenith or 90 degrees (6 hours) before it sets. Therefore it is noon. Exercise: Repeat the same with the first quarter Moon. Hint: A first quarter Moon is 90 degrees to the East of the Sun along the ecliptic circle, that is the Sun is 90 degrees to the west of the Moon along the ecliptic. In order to visualize and see the eastward sidereal motion of the Moon on the ecliptic (eastward motion with respect to the stars) and how the phases of the moon are formed I will give you some photos of the sky on May 20, 22, 24, 26, 2012 and on June 17 and one month later. We start from New moon and as the moon moves eastward from the sun it becomes waxing crescent until the 26 where it is a little less than first quarter. Observe how much faster than the Sun and the planets the moon is moving eastwards on the ecliptic with respect to the stars. The photos are always corresponding with the sky at noon. Please notice that the Moon Sun and planets participate to the daily (diurnal) westward motion as well like all the stars, on the top of their extra sidereal eastward shift along the ecliptic.

6 Notice that on May The Moon the Earth and the Sun are almost perfectly aligned and as viewed from the Earth the disk of the Moon almost covers completely the Sun. We may have an (annular) Solar eclipse.

7

8

9

10 On June 17, 2012 the Moon has almost completed the ecliptic circle and it moves eastward to meet with the sun once more. The next day we will have a new moon again. The Waning Crescent Moon is fairly visible in the sky.

11 On June we will have again New Moon but the Earth Moon and Sun are not now perfectly aligned. You can see that the disk of the Moon as viewed from earth is a little below from the Sun. This means that the moon is a little below the ecliptic plane and its shadow will miss the earth. That is why we cannot have an eclipse every New Moon (solar) and every Full Moon (Lunar).

Chapter 2 Discovering the Universe for Yourself. What does the universe look like from Earth? Constellations. 2.1 Patterns in the Night Sky

Chapter 2 Discovering the Universe for Yourself. What does the universe look like from Earth? Constellations. 2.1 Patterns in the Night Sky Chapter 2 Discovering the Universe for Yourself 2.1 Patterns in the Night Sky Our goals for learning: What does the universe look like from Earth? Why do stars rise and set? Why do the constellations we

More information

Chapter 2 Discovering the Universe for Yourself

Chapter 2 Discovering the Universe for Yourself Chapter 2 Discovering the Universe for Yourself 2.1 Patterns in the Night Sky Our goals for learning: What does the universe look like from Earth? Why do stars rise and set? Why do the constellations we

More information

Motion of the Sun. motion relative to the horizon. rises in the east, sets in the west on a daily basis. Basis for the unit of time, the DAY

Motion of the Sun. motion relative to the horizon. rises in the east, sets in the west on a daily basis. Basis for the unit of time, the DAY Motion of the Sun motion relative to the horizon rises in the east, sets in the west on a daily basis Basis for the unit of time, the DAY noon: highest point of Sun in sky relative to the horizon 1 altitude:

More information

Dive into Saturn.

Dive into Saturn. Dive into Saturn http://www.pbs.org/wgbh/nova/space/death-dive-to-saturn.html Read Ch. 3 By next class time Do practice online quiz 01 Axis tilt changes directness of sunlight during the year. Why Does

More information

Lecture 3 Angular Sizes, Moon Phases, and Ptolemy September 13, 2017

Lecture 3 Angular Sizes, Moon Phases, and Ptolemy September 13, 2017 1 Lecture 3 Angular Sizes, Moon Phases, and Ptolemy September 13, 2017 2 Measuring Angles Apparent distances in the sky are determined by measuring the angle between two objects. There are 360 degrees

More information

Chapter 2 Lecture. The Cosmic Perspective Seventh Edition. Discovering the Universe for Yourself

Chapter 2 Lecture. The Cosmic Perspective Seventh Edition. Discovering the Universe for Yourself Chapter 2 Lecture The Cosmic Perspective Seventh Edition Discovering the Universe for Yourself Discovering the Universe for Yourself 2.1 Patterns in the Night Sky Our goals for learning: What does the

More information

3. a. In the figure below, indicate the direction of the Sun with an arrow.

3. a. In the figure below, indicate the direction of the Sun with an arrow. Astronomy 100, Fall 2005 Name(s): Exercise 2: Seasons in the sun The following exercise illustrates some basic ideas about time, and how our position in the solar system uniquely configures the measurement

More information

REVIEW CH #0. 1) Right ascension in the sky is very similar to latitude on the Earth. 1)

REVIEW CH #0. 1) Right ascension in the sky is very similar to latitude on the Earth. 1) REVIEW CH #0 TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) Right ascension in the sky is very similar to latitude on the Earth. 1) 2) Latitude and right ascension

More information

The celestial sphere, the coordinates system, seasons, phases of the moon and eclipses. Chapters 2 and S1

The celestial sphere, the coordinates system, seasons, phases of the moon and eclipses. Chapters 2 and S1 The celestial sphere, the coordinates system, seasons, phases of the moon and eclipses Chapters 2 and S1 The celestial sphere and the coordinates system Chapter S1 How to find our way in the sky? Let s

More information

b. So at 12:00 p.m., are the shadows pointing in the direction you predicted? If they are not, you must explain this observation.

b. So at 12:00 p.m., are the shadows pointing in the direction you predicted? If they are not, you must explain this observation. Astronomy 100 Name(s): Exercise 2: Timekeeping and astronomy The following exercise illustrates some basic ideas about time, and how our position in the solar system uniquely configures the measurement

More information

Introduction To Modern Astronomy II

Introduction To Modern Astronomy II ASTR 111 003 Fall 2006 Lecture 03 Sep. 18, 2006 Introduction To Modern Astronomy II Introducing Astronomy (chap. 1-6) Planets and Moons (chap. 7-17) Ch1: Astronomy and the Universe Ch2: Knowing the Heavens

More information

from The Walrus and the Carpenter Through the Looking-Glass -- Lewis Carroll

from The Walrus and the Carpenter Through the Looking-Glass -- Lewis Carroll The Sun was shining on the sea, Shining with all his might; He did his very best to make The billows smooth and bright- And this was odd because it was The middle of the night. from The Walrus and the

More information

Unit 2. Cycles of the Sky

Unit 2. Cycles of the Sky Unit 2 Cycles of the Sky The Celestial Sphere Vast distances to stars prevent us from sensing their true 3-D arrangement Naked eye observations treat all stars at the same distance, on a giant celestial

More information

Before you Sit. Please Pick-up: Blue Information Sheet for Evening Observing. 1 Red and 1 Blue ticket for Observing/ Planetarium

Before you Sit. Please Pick-up: Blue Information Sheet for Evening Observing. 1 Red and 1 Blue ticket for Observing/ Planetarium Before you Sit Please Pick-up: Blue Information Sheet for Evening Observing. 1 Red and 1 Blue ticket for Observing/ Planetarium Evening Observing Observing at the Brooks Observatory: Three different weeks

More information

Explain how Earth's movement and the moon's orbit cause the phases of the moon. Explain the difference between a solar eclipse and a lunar eclipse.

Explain how Earth's movement and the moon's orbit cause the phases of the moon. Explain the difference between a solar eclipse and a lunar eclipse. Explain how Earth's movement and the moon's orbit cause the phases of the moon. Explain the difference between a solar eclipse and a lunar eclipse. The Earth- Moon System Have you ever wondered why the

More information

1-2. What is the name given to the path of the Sun as seen from Earth? a.) Equinox b.) Celestial equator c.) Solstice d.) Ecliptic

1-2. What is the name given to the path of the Sun as seen from Earth? a.) Equinox b.) Celestial equator c.) Solstice d.) Ecliptic Chapter 1 1-1. How long does it take the Earth to orbit the Sun? a.) one sidereal day b.) one month c.) one year d.) one hour 1-2. What is the name given to the path of the Sun as seen from Earth? a.)

More information

Eclipses September 12th, 2013

Eclipses September 12th, 2013 Eclipses September 12th, 2013 Who was the favorite Star Wars character of the class? A) Obi-Wan B) Jar Jar C) Luke Skywalker D) Yoda News! Dark matter http://mcdonaldobservatory.org/news/releases/2013/09/10

More information

Astronomy 120 Winter 2005 Highlights of Astronomy. First Midterm Examination

Astronomy 120 Winter 2005 Highlights of Astronomy. First Midterm Examination Astronomy 120 Winter 2005 Highlights of Astronomy First Midterm Examination Name: MULTIPLE CHOICE: Choose the one best answer from among the five choices for each of the following 6 questions. Each correct

More information

Motions in the Sky. Stars Planets Sun Moon. Photos - APOD. Motions in the Sky - I. Intro to Solar System

Motions in the Sky. Stars Planets Sun Moon. Photos - APOD. Motions in the Sky - I. Intro to Solar System Motions in the Sky Stars Planets Sun Moon Photos - APOD 1 STARS: background for motion of other objects patterns - constellations zodiac: special set of constellations trace the apparent path of the Sun

More information

Chapter 1: Discovering the Night Sky. The sky is divided into 88 unequal areas that we call constellations.

Chapter 1: Discovering the Night Sky. The sky is divided into 88 unequal areas that we call constellations. Chapter 1: Discovering the Night Sky Constellations: Recognizable patterns of the brighter stars that have been derived from ancient legends. Different cultures have associated the patterns with their

More information

2.2 The Reason for Seasons

2.2 The Reason for Seasons 2.2 The Reason for Seasons Our goals for learning: What causes the seasons? How does the orientation of Earth's axis change with time? Thought Question TRUE OR FALSE? Earth is closer to the Sun in summer

More information

Welcome back. Scale. Week 2 Updates. PHYS 1302 Astronomy of the Solar System

Welcome back. Scale. Week 2 Updates. PHYS 1302 Astronomy of the Solar System Week 2 Updates Two in-class quizzes now completed Introductions List-serve Quick review of Chapter 1 Discuss Chapter 2 Chapter 3 next week (9/9). Welcome back Week 2 of PHYS 1302 Como se dice The h Syllabus:

More information

The Sky Perceptions of the Sky

The Sky Perceptions of the Sky The Sky Perceptions of the Sky An Observer-Centered Hemisphere Night & Day - Black & Blue - Stars & Sun Atmospheric & Astronomical Phenomena Weather, Clouds, Rainbows,... versus Sun, Moon, Stars, Planets,...

More information

Homework 1 (from text) Latest Deep Impact Results: 2. Discovering the Universe for Yourself.

Homework 1 (from text)  Latest Deep Impact Results:  2. Discovering the Universe for Yourself. 2. Discovering the Universe for Yourself We had the sky, up there, all speckled with stars, and we used to lay on our backs and look up at them, and discuss about whether they was made, or only just happened.

More information

Earth Science, 11e. Origin of Modern Astronomy Chapter 21. Early history of astronomy. Early history of astronomy. Early history of astronomy

Earth Science, 11e. Origin of Modern Astronomy Chapter 21. Early history of astronomy. Early history of astronomy. Early history of astronomy 2006 Pearson Prentice Hall Lecture Outlines PowerPoint Chapter 21 Earth Science 11e Tarbuck/Lutgens This work is protected by United States copyright laws and is provided solely for the use of instructors

More information

3) During retrograde motion a planet appears to be A) dimmer than usual. B) the same brightness as usual C) brighter than usual.

3) During retrograde motion a planet appears to be A) dimmer than usual. B) the same brightness as usual C) brighter than usual. Descriptive Astronomy (ASTR 108) Exam 1 B February 17, 2010 Name: In each of the following multiple choice questions, select the best possible answer. In the line on the scan sheet corresponding to the

More information

1) Kepler's third law allows us to find the average distance to a planet from observing its period of rotation on its axis.

1) Kepler's third law allows us to find the average distance to a planet from observing its period of rotation on its axis. Descriptive Astronomy (ASTR 108) Exam 1 A February 17, 2010 Name: In each of the following multiple choice questions, select the best possible answer. In the line on the scan sheet corresponding to the

More information

SPI Use data to draw conclusions about the major components of the universe.

SPI Use data to draw conclusions about the major components of the universe. SPI 0607.6.1 - Use data to draw conclusions about the major components of the universe. o Stars are huge, hot, brilliant balls of gas trillions of kilometers away. A Galaxy is a collection of billions

More information

AST 301 Introduction to Astronomy

AST 301 Introduction to Astronomy AST 301 Introduction to Astronomy John Lacy RLM 16.332 471-1469 lacy@astro.as.utexas.edu Myoungwon Jeon RLM 16.216 471-0445 myjeon@astro.as.utexas.edu Bohua Li RLM 16.212 471-8443 bohuali@astro.as.utexas.edu

More information

3. Lunar Motions & Eclipses. Lunar Phases: Static & Dynamic. Static & Dynamic Lunar Phases. Earth & Moon: Both Show Phases!

3. Lunar Motions & Eclipses. Lunar Phases: Static & Dynamic. Static & Dynamic Lunar Phases. Earth & Moon: Both Show Phases! 3. Lunar Motions & Eclipses Lunar motions & lunar phases Lunar axial rotation & orbital revolution Eclipses & the line of nodes Lunar eclipses Solar eclipses Relative Earth-Moon-Sun distances Lunar Motions

More information

The reason is that the Moon s rotation takes 27.3 days the same amount of time it takes to revolve once around Earth. Because these two motions take

The reason is that the Moon s rotation takes 27.3 days the same amount of time it takes to revolve once around Earth. Because these two motions take Moon Phases 6.E.1.1 Explain how the relative motion and relative position of the sun, Earth and moon affect the seasons, tides, phases of the moon, and eclipses. Motions of the Moon Just as Earth rotates

More information

Free Lunar Phases Interactive Organizer

Free Lunar Phases Interactive Organizer Free Lunar Phases Interactive Organizer Created by Gay Miller Gay Miller Page 1 Lunar Phases MS-ESS1-1. Develop and use a model of the Earth-sun-moon system to describe the cyclic patterns of lunar phases,

More information

Astronomy 291. Professor Bradley M. Peterson

Astronomy 291. Professor Bradley M. Peterson Astronomy 291 Professor Bradley M. Peterson The Sky As a first step, we need to understand the appearance of the sky. Important points (to be explained): The relative positions of stars remain the same

More information

Planets in the Sky ASTR 101 2/16/2018

Planets in the Sky ASTR 101 2/16/2018 Planets in the Sky ASTR 101 2/16/2018 1 Planets in the Sky 2018 paths of Jupiter among stars (2017/2018) Unlike stars which have fixed positions in the sky (celestial sphere), planets seem to move with

More information

Yr1 Lesson 1. The Great Circles of Astrology, the Angles, Precession,

Yr1 Lesson 1. The Great Circles of Astrology, the Angles, Precession, Yr1 Lesson 1 The Great Circles of Astrology, the Angles, Precession, Cosmic Intelligence Agency 2015 Astro Lesson 1! Signs, Symbols, Glyphs and Charts! The Celestial Sphere Great Circles of Astrology -

More information

Lecture #4: Plan. Early Ideas of the Heavens (cont d): Geocentric Universe Heliocentric Universe

Lecture #4: Plan. Early Ideas of the Heavens (cont d): Geocentric Universe Heliocentric Universe Lecture #4: Plan Early Ideas of the Heavens (cont d): Shape & size of the Earth Size & distance of Moon & Sun Geocentric Universe Heliocentric Universe Shape of the Earth Aristotle (Greece, 384 322 B.C.)

More information

The Sky. Day sky: the Sun, occasionally the Moon. Night Sky: stars, and sometimes the Moon

The Sky. Day sky: the Sun, occasionally the Moon. Night Sky: stars, and sometimes the Moon The Sky Day sky: the Sun, occasionally the Moon Night Sky: stars, and sometimes the Moon So MANY objects.how Do We Make Sense of it ALL?? Goal How to describe the locations of objects in the sky To understand

More information

Science : Introduction to Astronomy. Lecture 2 : Visual Astronomy -- Stars and Planets. Robert Fisher

Science : Introduction to Astronomy. Lecture 2 : Visual Astronomy -- Stars and Planets. Robert Fisher Science 3210 001 : Introduction to Astronomy Lecture 2 : Visual Astronomy -- Stars and Planets Robert Fisher Items Add/Drop Day Office Hours Vote 5 PM Tuesday 5 PM Thursday 12 Noon Friday Course Webpage

More information

DeAnza College Winter Second Midterm Exam Section 04 MAKE ALL MARKS DARK AND COMPLETE.

DeAnza College Winter Second Midterm Exam Section 04 MAKE ALL MARKS DARK AND COMPLETE. FAMILY NAME : (Please PRINT!) GIVEN NAME : (Please PRINT!) Signature: ASTRONOMY 4 DeAnza College Winter 2018 Second Midterm Exam Section 04 MAKE ALL MARKS DARK AND COMPLETE. Instructions: 1. On your Parscore

More information

The changing phases of the Moon originally inspired the concept of the month

The changing phases of the Moon originally inspired the concept of the month The changing phases of the Moon originally inspired the concept of the month Moon Properties The Moon is in orbit around the Earth, outside the atmosphere. The Moon shines by reflected light (12%) - mostly

More information

The Ecliptic on the Celestial. Sphere. The Celestial Sphere. Astronomy 210. Section 1 MWF Astronomy Building. celestial equator are not

The Ecliptic on the Celestial. Sphere. The Celestial Sphere. Astronomy 210. Section 1 MWF Astronomy Building. celestial equator are not Astronomy 210 Section 1 MWF 1500-1550 134 Astronomy Building This Class (Lecture 3): Lunar Phases Check Planetarium Schedule Next Class: HW1 Due Friday! Early Cosmology Music: We only Come out at Night

More information

Remember that for one of your observing projects you can go to a star party (stargazing). This is available at the Lawrence Hall of Science every 1st

Remember that for one of your observing projects you can go to a star party (stargazing). This is available at the Lawrence Hall of Science every 1st Observing Project Remember that for one of your observing projects you can go to a star party (stargazing). This is available at the Lawrence Hall of Science every 1st and 3rd Saturday of the month. For

More information

a. exactly 360 b. less than 360 c. more than 360 On Figure 1, draw the Earth the next day and justify your answer above.

a. exactly 360 b. less than 360 c. more than 360 On Figure 1, draw the Earth the next day and justify your answer above. Astronomy 100, Fall 2006 Name(s): Exercise 3: Geocentrism and heliocentrism In the previous exercise, you saw how the passage of time is intimately related to the motion of celestial objects. This, of

More information

Earth is rotating on its own axis

Earth is rotating on its own axis Earth is rotating on its own axis 1 rotation every day (24 hours) Earth is rotating counterclockwise if you are looking at its North pole from other space. Earth is rotating clockwise if you are looking

More information

4 th Grade: Sun, Moon, and Earth Unit Assessment Study Guide

4 th Grade: Sun, Moon, and Earth Unit Assessment Study Guide Name: Teacher: Test Date: 4 th Grade: Sun, Moon, and Earth Unit Assessment Study Guide Vocabulary: Solar System: A group of objects that revolve around a single star. Sun: The central (and only) star in

More information

Question 1. What motion is responsible for the apparent motion of the constellations (east to west) across the sky?

Question 1. What motion is responsible for the apparent motion of the constellations (east to west) across the sky? What motion is responsible for the apparent motion of the constellations (east to west) across the sky? Question 1 1) the motion of Earth around the Sun 2) the motion of the Moon around Earth 3) the motion

More information

Discovering the Night Sky

Discovering the Night Sky Discovering the Night Sky Guiding Questions 1. What role did astronomy play in ancient civilizations? 2. Are the stars that make up a constellation actually close to one another? 3. Are the same stars

More information

Origin of Modern Astronomy Chapter 21

Origin of Modern Astronomy Chapter 21 Origin of Modern Astronomy Chapter 21 Early history of astronomy Ancient Greeks Used philosophical arguments to explain natural phenomena Also used some observa:onal data (looking at the night sky) Ancient

More information

STANDARD. S6E1 d: Explain the motion of objects in the day/night sky in terms of relative position.

STANDARD. S6E1 d: Explain the motion of objects in the day/night sky in terms of relative position. STANDARD S6E1 d: Explain the motion of objects in the day/night sky in terms of relative position. S6E2 c. Relate the tilt of the Earth to the distribution of sunlight throughout the year and to its effect

More information

Tutoring information, as announced in class

Tutoring information, as announced in class Announcements Register for Connect, register your iclickers - Register iclickers at https://www1.iclicker.com/ or REEF account profile - Purchase the REEF polling app, create an account, register and get

More information

Phys Homework Set 2 Fall 2015 Exam Name

Phys Homework Set 2 Fall 2015 Exam Name Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Increasing the temperature of a blackbody by a factor of 2 will increase its energy by

More information

Astronomy 101 Lab: Lunar Phases and Eclipses

Astronomy 101 Lab: Lunar Phases and Eclipses Name: Astronomy 101 Lab: Lunar Phases and Eclipses Pre-Lab Assignment: In this week's lab, you will be using a lamp, a globe, and a ball to simulate the Sun, Earth, and the Moon. You will be able to see

More information

Q25: Record the wavelength of each colored line according to the scale given.

Q25: Record the wavelength of each colored line according to the scale given. C. Measurement Errors and Uncertainties The term "error" signifies a deviation of the result from some "true" value. Often in science, we cannot know what the true value is, and we can only determine estimates

More information

18.2 Earth Cycles Days and years Calendars Years and days Leap years Calendars throughout human history 20,000 years ago. 7,000 BC. 4,000 BC.

18.2 Earth Cycles Days and years Calendars Years and days Leap years Calendars throughout human history 20,000 years ago. 7,000 BC. 4,000 BC. 18.2 Reading 18.2 Earth Cycles Do you ever wonder where our calendar comes from? Or why the Moon gradually changes its shape? Or why we have seasons? The answers have to do with the relative positions

More information

Exam 1 Astronomy 114. Part 1

Exam 1 Astronomy 114. Part 1 Exam 1 Astronomy 114 Part 1 [1-40] Select the most appropriate answer among the choices given. 1. If the Moon is setting at 6AM, the phase of the Moon must be (A) first quarter. (B) third quarter. (C)

More information

Lecture 2: Motions of the Earth and Moon. Astronomy 111 Wednesday August 30, 2017

Lecture 2: Motions of the Earth and Moon. Astronomy 111 Wednesday August 30, 2017 Lecture 2: Motions of the Earth and Moon Astronomy 111 Wednesday August 30, 2017 Reminders Online homework #1 due Monday at 3pm Labs start next week Motions of the Earth ASTR111 Lecture 2 Observation:

More information

Day, Night & the Seasons. Lecture 2 1/21/2014

Day, Night & the Seasons. Lecture 2 1/21/2014 Day, Night & the Seasons Lecture 2 1/21/2014 Logistics The following students see me after class: A. Gonzalez, Chen Anyone who was not here on first day see me after class Pin Numbers - if you have not

More information

Today. Solstices & Equinoxes Precession Phases of the Moon Eclipses. Ancient Astronomy. Lunar, Solar FIRST HOMEWORK DUE NEXT TIME

Today. Solstices & Equinoxes Precession Phases of the Moon Eclipses. Ancient Astronomy. Lunar, Solar FIRST HOMEWORK DUE NEXT TIME Today Solstices & Equinoxes Precession Phases of the Moon Eclipses Lunar, Solar Ancient Astronomy FIRST HOMEWORK DUE NEXT TIME Tropic: Latitude where the sun [just] reaches the zenith at noon on the summer

More information

Solar System Astronomy. The Perspective From Earth

Solar System Astronomy. The Perspective From Earth Solar System Astronomy The Perspective From Earth OBSERVATIONS: 1 Days and Years 1 The sun frequently rises in the east and sets in the west. We call this a day from one rise to the next. 2 In the northern

More information

Celestial Sphere & Solar Motion Lab (Norton s Star Atlas pages 1-4)

Celestial Sphere & Solar Motion Lab (Norton s Star Atlas pages 1-4) Name: Date: Celestial Sphere & Solar Motion Lab (Norton s Star Atlas pages 1-4) Italicized topics below will be covered only at the instructor s discretion. 1.0 Purpose: To understand a) the celestial

More information

ASTRONOMY 1010 Exam 1 September 21, 2007

ASTRONOMY 1010 Exam 1 September 21, 2007 ASTRONOMY 1010 Exam 1 September 21, 2007 Name Please write and mark your name and student number in the Scantron answer sheet. FILL THE BUBBLE IN THE "TEST FORM" BOX CORRESPONDING TO YOUR TEST VERSION

More information

Introduction To Modern Astronomy I: Solar System

Introduction To Modern Astronomy I: Solar System ASTR 111 003 Fall 2007 Lecture 02 Sep. 10, 2007 Introduction To Modern Astronomy I: Solar System Introducing Astronomy (chap. 1-6) Planets and Moons (chap. 7-15) Chap. 16: Our Sun Chap. 28: Search for

More information

Astronomy A BEGINNER S GUIDE TO THE UNIVERSE EIGHTH EDITION

Astronomy A BEGINNER S GUIDE TO THE UNIVERSE EIGHTH EDITION Astronomy A BEGINNER S GUIDE TO THE UNIVERSE EIGHTH EDITION CHAPTER 0 Charting the Heavens Lecture Presentation 0.0 Astronmy a why is that subject! Q. What rare astronomical event happened in late summer

More information

Exam #1 Covers material from first day of class, all the way through Tides and Nature of Light Supporting reading chapters 1-5 Some questions are

Exam #1 Covers material from first day of class, all the way through Tides and Nature of Light Supporting reading chapters 1-5 Some questions are Exam #1 Covers material from first day of class, all the way through Tides and Nature of Light Supporting reading chapters 1-5 Some questions are concept questions, some involve working with equations,

More information

Exercise 7.0 THE CHANGING DIURNAL CIRCLES OF THE SUN

Exercise 7.0 THE CHANGING DIURNAL CIRCLES OF THE SUN Exercise 7.0 THE CHANGING DIURNAL CIRCLES OF THE SUN I. The Apparent Annual Motion of the Sun A star always rises and sets at the same place on the horizon and, hence, it is above the horizon for the same

More information

Lab 2: Angles and other needed math (or the history of astronomy)

Lab 2: Angles and other needed math (or the history of astronomy) Astronomy 101 Name(s): Lab 2: Angles and other needed math (or the history of astronomy) Purpose: This lab is an overview of much of the math skills you will need for this course. As I hope you will see

More information

PHYS 155 Introductory Astronomy

PHYS 155 Introductory Astronomy PHYS 155 Introductory Astronomy - observing sessions: Sunday Thursday, 9pm, weather permitting http://www.phys.uconn.edu/observatory - Exam - Tuesday March 20, - Review Monday 6:30-9pm, PB 38 Marek Krasnansky

More information

The Origin of Modern Astronomy. Nicolai Copernicus ( )

The Origin of Modern Astronomy. Nicolai Copernicus ( ) The Origin of Modern Astronomy Nicolai Copernicus (1473-1543) Goals for Today Complete our study of the Moon: lunar phases, the Sun-Earth-Moon geometry, and the eclipses Tides and their origin Earth's

More information

Discovering the Universe

Discovering the Universe Discovering the Universe Astronomy and human culture have always been intertwined Astronomical events day and night, seasons -- have defined the rhythms of human life They have inspired great myths and

More information

Astronomy 100 Section 2 MWF Greg Hall

Astronomy 100 Section 2 MWF Greg Hall Astronomy 100 Section 2 MWF 1200-1300 100 Greg Hall Leslie Looney Phone: 217-244-3615 Email: lwl @ uiuc. edu Office: Astro Building #218 Office Hours: MTF 10:30-11:30 a.m. or by appointment Class Web Page

More information

Exercise 3: The history of astronomy

Exercise 3: The history of astronomy Astronomy 100 Name(s): Exercise 3: The history of astronomy In the previous exercise, you saw how the passage of time is intimately related to the motion of celestial objects. This, of course, led many

More information

Practice Exam #3. Part 1: The Circumpolar Constellations

Practice Exam #3. Part 1: The Circumpolar Constellations Practice Exam #3 2002 Ann Bykerk-Kauffman, Dept. of Geological and Environmental Sciences, California State University, Chico * Some Comments on the Real Exam This exam covers all material related to astronomy.

More information

Lunar Motion. V. Lunar Motion. A. The Lunar Calendar. B. Motion of Moon. C. Eclipses. A. The Lunar Calendar. 1) Phases of the Moon. 2) The Lunar Month

Lunar Motion. V. Lunar Motion. A. The Lunar Calendar. B. Motion of Moon. C. Eclipses. A. The Lunar Calendar. 1) Phases of the Moon. 2) The Lunar Month Lunar Motion Dr. Bill Pezzaglia V. Lunar Motion A. The Lunar Calendar B. Motion of Moon 2 Updated 2012Oct03 C. Eclipses A. The Lunar Calendar 3 1. Phases of Moon 4 1) Phases of the Moon 2) The Lunar Month

More information

[04] Seasons, Phases, and Eclipses (9/7/17)

[04] Seasons, Phases, and Eclipses (9/7/17) 1 [04] Seasons, Phases, and Eclipses (9/7/17) Upcoming Items Homework #2 due next lecture. Read Ch. 3.3 and do the self-study quizzes for next lecture, and skim 2.4, 3.1, 3.2, & 3.4. https://pbs.twimg.com/media/dh69il_u0aenivq.jpg:large

More information

1. The Moon appears larger when it rises than when it is high in the sky because

1. The Moon appears larger when it rises than when it is high in the sky because 2-1 Copyright 2016 All rights reserved. No reproduction or distribution without the prior written consent of 1. The Moon appears larger when it rises than when it is high in the sky because A. you are

More information

Name: Class: Date: ID: A

Name: Class: Date: ID: A Name: Class: _ Date: _ Astro Quiz 2 (ch2) Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Star A has an apparent visual magnitude of 13.4 and star B has

More information

Gravitation Part I. Ptolemy, Copernicus, Galileo, and Kepler

Gravitation Part I. Ptolemy, Copernicus, Galileo, and Kepler Gravitation Part I. Ptolemy, Copernicus, Galileo, and Kepler Celestial motions The stars: Uniform daily motion about the celestial poles (rising and setting). The Sun: Daily motion around the celestial

More information

8.9 Observing Celestial Objects from Earth

8.9 Observing Celestial Objects from Earth 8.9 Observing Celestial Objects from Earth Celestial objects are visible from Earth both by day and by night. In the daytime you can see the Sun and, sometimes, the Moon. Looking up at the night sky on

More information

Lunar Motion. V. Lunar Motion. A. The Lunar Calendar. B. Motion of Moon. C. Eclipses. A. The Lunar Calendar. 1) Phases of the Moon. 2) The Lunar Month

Lunar Motion. V. Lunar Motion. A. The Lunar Calendar. B. Motion of Moon. C. Eclipses. A. The Lunar Calendar. 1) Phases of the Moon. 2) The Lunar Month Lunar Motion Dr. Bill Pezzaglia V. Lunar Motion A. The Lunar Calendar B. Motion of Moon 2 Updated 2014Jan17 C. Eclipses A. The Lunar Calendar 3 1. Phases of Moon 4 1) Phases of the Moon 2) The Lunar Month

More information

Test 1 Review Chapter 1 Our place in the universe

Test 1 Review Chapter 1 Our place in the universe Test 1 Review Bring Gator 1 ID card Bring pencil #2 with eraser No use of calculator or any electronic device during the exam We provide the scantrons Formulas will be projected on the screen You can use

More information

BROCK UNIVERSITY. Test 1: October 2014 Number of pages: 9 Course: ASTR 1P01, Section 2 Number of students: 950

BROCK UNIVERSITY. Test 1: October 2014 Number of pages: 9 Course: ASTR 1P01, Section 2 Number of students: 950 BROCK UNIVERSITY Page 1 of 9 Test 1: October 2014 Number of pages: 9 Course: ASTR 1P01, Section 2 Number of students: 950 Examination date: 3 October 2013 Time limit: 50 min Time of Examination: 20:00

More information

Daily Motions. Daily Motions. Solar and Sidereal Days. Annual Motions of the Sun. Coordinate system on Earth. Annual Motion of the Stars.

Daily Motions. Daily Motions. Solar and Sidereal Days. Annual Motions of the Sun. Coordinate system on Earth. Annual Motion of the Stars. Sun: rises in the east sets in the west travels on an arc across the sky 24 hours Daily Motions Solar Day = 24 hours Stars: stars travel on arcs in the sky moving from east to west. some stars rise and

More information

In the space below, write an explanation for why we observe phases of the moon, based upon your current knowledge:

In the space below, write an explanation for why we observe phases of the moon, based upon your current knowledge: IDS 102 Phases of the Moon PART II In the space below, write an explanation for why we observe phases of the moon, based upon your current knowledge: As you discovered yesterday, when we observe the Earth

More information

Astronomy. Today: Eclipses and the Motion of the Moon. First homework on WebAssign is due Thursday at 11:00pm

Astronomy. Today: Eclipses and the Motion of the Moon. First homework on WebAssign is due Thursday at 11:00pm Astronomy A. Dayle Hancock adhancock@wm.edu Small 239 Today: Eclipses and the Motion of the Moon > > > Office hours: MTWR 10-11am First homework on WebAssign is due Thursday at 11:00pm > > > Phases of

More information

Explain the Big Bang Theory and give two pieces of evidence which support it.

Explain the Big Bang Theory and give two pieces of evidence which support it. Name: OBJECTIVES Correctly define: asteroid, celestial object, comet, constellation, Doppler effect, eccentricity, eclipse, ellipse, focus, Foucault Pendulum, galaxy, geocentric model, heliocentric model,

More information

Knowing the Heavens. Goals: Constellations in the Sky

Knowing the Heavens. Goals: Constellations in the Sky Goals: Knowing the Heavens To see how the sky changes during a night and from night to night. To measure the positions of stars in celestial coordinates. To understand the cause of the seasons. Constellations

More information

Homework Assignment #7: The Moon

Homework Assignment #7: The Moon Name Homework Assignment #7: The Moon 2008 Ann Bykerk-Kauffman, Dept. of Geological and Environmental Sciences, California State University, Chico * Chapter 21 Origins of Modern Astronomy Motions of the

More information

Astronomy Club of Asheville December 2017 Sky Events

Astronomy Club of Asheville December 2017 Sky Events December 2017 Sky Events The Planets this Month - page 2 December 13-16 Crescent Moon with Jupiter and Mars page 8 Planet Highlights - page 9 Moon Phases - page 12 December 13 th Geminid Meteor Shower

More information

Unit 7: Partner Resource. Sun and Moon

Unit 7: Partner Resource. Sun and Moon Earth and Space Systems: Relative Positions of Sun, Earth and Moon, Patterns and Seasons Washington University in St. Louis Institute for School Partnership Unit 7: Partner Resource Sun and Moon Additional

More information

Local Coordinates. These are centered upon you, the observer.

Local Coordinates. These are centered upon you, the observer. Astronomy 30, Observing #3 Name: Lab Partners: Date: Materials: This lab, with the star chart completed from the pre-lab. Some sheets of paper for sketches. A pencil with eraser. A small flashlight, ideally

More information

Astronomy I Exam I Sample Name: Read each question carefully, and choose the best answer.

Astronomy I Exam I Sample Name: Read each question carefully, and choose the best answer. Name: Read each question carefully, and choose the best answer. 1. During a night in Schuylkill Haven, most of the stars in the sky (A) are stationary through the night. (B) the actual motion depends upon

More information

SAMPLE First Midterm Exam

SAMPLE First Midterm Exam Astronomy 1000 Dr C. Barnbaum SAMPLE First Midterm Exam Note: This is a sample exam. It is NOT the exam you will take. I give out sample exams so that you will have an understanding of the depth of knowledge

More information

Unit 1 Discovering the Heavens I. Introduction to Astronomy A. Celestial Sphere

Unit 1 Discovering the Heavens I. Introduction to Astronomy A. Celestial Sphere Unit 1 Discovering the Heavens I. Introduction to Astronomy A. Celestial Sphere celestial sphere - a model that represents the real sky with the Earth at the center - used to help visualize positions of

More information

Chapter S1 Celestial Timekeeping and Navigation. How do we define the day, month, year, and planetary time periods?

Chapter S1 Celestial Timekeeping and Navigation. How do we define the day, month, year, and planetary time periods? Chapter S1 Celestial Timekeeping and Navigation S1.1 Astronomical Time Periods Our goals for learning:! How do we define the day, month, year, and planetary time periods?! How do we tell the time of day?!

More information

Chapter 02 The Rise of Astronomy

Chapter 02 The Rise of Astronomy Chapter 02 The Rise of Astronomy Multiple Choice Questions 1. The moon appears larger when it rises than when it is high in the sky because A. You are closer to it when it rises (angular-size relation).

More information

Introduction to the sky

Introduction to the sky Introduction to the sky On a clear, moonless night, far from city lights, the night sky is magnificent. Roughly 2000 stars are visible to the unaided eye. If you know where to look, you can see Mercury,

More information

A. the spinning of Earth on its axis B. the path of the Sun around Earth

A. the spinning of Earth on its axis B. the path of the Sun around Earth stronomy 1 Packet Write answers on your own paper 1. The Sun appears to move across the sky each day. What causes this?. the spinning of Earth on its axis. the path of the Sun around Earth. the production

More information

drinking straw, protractor, string, and rock. observer on Earth. Sun across the sky on March 21 as seen by an

drinking straw, protractor, string, and rock. observer on Earth. Sun across the sky on March 21 as seen by an 1. The diagram below represents some constellations and one position of Earth in its orbit around the Sun. These constellations are visible to an observer on Earth at different times of the year. When

More information

DeAnza College Fall Second Midterm Exam MAKE ALL MARKS DARK AND COMPLETE.

DeAnza College Fall Second Midterm Exam MAKE ALL MARKS DARK AND COMPLETE. FAMILY NAME : (Please PRINT!) GIVEN NAME : (Please PRINT!) Signature: ASTRONOMY 4 DeAnza College Fall 2017 Second Midterm Exam MAKE ALL MARKS DARK AND COMPLETE. Instructions: 1. On your Parscore sheet

More information

How many days are between exactly the same Moon phase?

How many days are between exactly the same Moon phase? IDS 102 Phases of the Moon- Part II Along with this part of the handout you should receive a two page handout of the appearance of the Moon over the previous month. Look carefully at the appearance of

More information