# Astronomy A BEGINNER S GUIDE TO THE UNIVERSE EIGHTH EDITION

Size: px
Start display at page:

Transcription

1 Astronomy A BEGINNER S GUIDE TO THE UNIVERSE EIGHTH EDITION CHAPTER 0 Charting the Heavens Lecture Presentation

2 0.0 Astronmy a why is that subject! Q. What rare astronomical event happened in late summer 2017 in the US? A. A total solar eclipse! (but what does: Total and Solar and Eclipse mean?)

3 0.1 The Obvious View Universe: Totality of all space, time, matter, and energy Astronomy: Study of the universe But be warned: you will probably find that the universe is more amazing than almost anything else you know! So let s get started!

4 0.1 The Obvious View About 3000 stars are visible at any one time. Humans see patterns that we call constellations. Constellations have meaning to those doing the grouping but differ from group to group! Hmmm! Useful: Polaris, which is almost due north, is called the north star. Astrology makes predictions about individuals based on the star patterns at their birth: what do you think?

5 0.1 The Obvious View Time lapse photo looking north. What does this tell us? What are the streaks in the sky? Why are some streaks longer than others?

6 0.1 The Obvious View Stars, eg in constellation Orion, that appear close in the sky may not actually be close in space. Why is that!? Because they are so very far away!

7 0.1 The Obvious View The celestial sphere: Stars seem to be on the inner surface of a sphere surrounding the Earth. They aren t, but we can use two-dimensional spherical coordinates (similar to latitude and longitude) to locate sky objects. The Earth s rotation makes the stars appear to move: 15 degrees/hour

8 0.1 The Obvious View Declination (like latitude): Degrees north or south of celestial equator. Right ascension (like longitude): Measured in hours, minutes and seconds with 1 hour = 15 degrees.

9 More Precisely 0.1: Angular Measure Full circle contains 360º (degrees). Each degree contains 60 (arc minutes). Each arc minute contains 60 (arc seconds). Angular size of an object depends on its actual size and distance from Earth.

10 0.1 The Obvious View Measuring angles in the sky: eg the angular size of the Moon is about ½ degree!

11 0.2 Earth s Orbital Motion Earth s daily cycle (due to Earth s rotation on its axis): Sun overhead to Sun overhead, is diurnal motion solar day. Stars aren t in quite the same place 24 hours later, though, due to Earth s revolution around the Sun; when stars are in the same place again, one sidereal day has passed: Is this a shorter or longer period of time? Only astronomers care about this!

12 0.2 Earth s Orbital Motion Seasonal changes to the night sky are due to Earth s revolution around Sun! Why do we see different constellations in the summer VS in the winter?

13 0.2 Earth s Orbital Motion As the Earth revolves around the Sun the part of the celestial sphere that is in night time changes! As stars are only visible at night then different stars are visible at different times of the year. As radio telescopes (Chapt 3) do not care if it is day or night they can observe eg Orion every day: but sometimes it is in daytime and sometimes it is when it is night time!

14 0.2 Earth s Orbital Motion The entire sky is divided into 88 (modern day) constellations: see figure. Today this is mostly for convenience: think how we use the fact that the continental US is divided into 48 states! The Sun s path is the ecliptic (red dotted line), which traces through 12 of the constellations.

15 0.2 Earth s Orbital Motion The 12 constellations the Sun appears to move through are called the zodiac.

16 0.2 Earth s Orbital Motion Ecliptic is (also) plane of Earth s path around the Sun. It is tilted by 23.5º to celestial equator because Earth s rotation axis is tilted by 23.5 o. Sun s northern-most point (above celestial equator) is summer solstice; southern-most is winter solstice; points where path crosses celestial equator are vernal and autumnal equinoxes. Combination of day length and sunlight angle gives seasons. Time from one vernal equinox to next is tropical year.

17 0.2 Earth s Orbital Motion The Earth s rotation axis points in a fixed direction, BUT because it is not at 90 degrees to the plane of the Earth s orbit, sometimes the northern hemisphere has the Sun more overhead and sometimes the southern hemisphere has the Sun more overhead (see previous page)!

18 0.2 Earth s Orbital Motion Time from one vernal equinox to next, i.e. from one beginning of spring to the next is set by the position of the Sun as viewed from the Earth, is called a tropical year. Time for Earth to orbit once around the Sun, but set by the position of the Sun with respect to the fixed stars, is called a sidereal year. Tropical year follows seasons (so we care about this!); sidereal year follows distant stars (only astronomers care about this!).

19 0.3 The Motion of the Moon The Moon takes about 29.5 days to go through whole cycle of phases the synodic month. Phases are due to different amounts of sunlit portion of the Moon being visible from Earth. To see tonight s phase go to: phase/today Note: for the Moon to revolve around the Earth, aka sidereal month, the time is ~2 days shorter than synodic month only astronomers care about this!

20 0.3 The Motion of the Moon For those super nerdy: the Moon s sidereal and synodic months are analogous to Earth s sidereal and solar days. As we care about Moon phases we care about the longer 29.5 day synodic month!

21 0.3 Motion of the Moon Eclipses occur when Earth, Moon, and Sun form a straight line but most importantly when one (Earth or Moon) is in the shadow cast by the other!

22 0.3 The Motion of the Moon Lunar eclipse: Occurs when Earth is between the Moon and Sun. A partial eclipse occurs when only part of the Moon is in shadow. A total eclipse occurs when all the Moon is in shadow.

23 0.3 The Motion of the Moon Solar eclipse: The Moon is between Earth and Sun. Because the umbra shadow is tapered and the moon s orbit is not round: some eclipses are annular!

24 0.3 The Motion of the Moon A solar eclipse is partial when only part of the Sun is blocked, total when all is blocked, and annular when the Moon is too far from Earth for total.

25 0.3 The Motion of the Moon Eclipses don t occur every month because Earth s and the Moon s orbits are not in the same plane. Thus only two points on the Earth s orbit are favorable for eclipses! Can you find these in this figure?

26 0.3 The Motion of the Moon (Predicted and actual) Solar Eclipse tracks (locations on Earth for viewing solar eclipses), See the Aug 21 eclipse:

27 0.5 Science and the Scientific Method Scientific method: Observations à theory à predictions then make new observations. Do new observations agree with predictions or not? Then what do you do? Scientific theories: Must be testable (i.e. allow predictions to be made for observable(s) that can be tested by observations). Should be continually tested: particularly as the quality of observations improve. Should be simple and elegant not essential but deep understanding usually finds simple, elegant underlying truths Scientific theories can be proven wrong, but they can never be proven right with 100% certainty Is that a reason to 2017 Pearson discount Education, Inc. (or ignore) them?

28 0.5 Science and the Scientific Method So: observations naturally lead to a theory to explaining them. Theory leads to predictions consistent with previous observations. Predictions of new phenomena are then observed. If the observations agree with the prediction, more predictions should be made. If not, a new theory should be made. Sounds simple; also profound! Try it!

29 Summary of Chapter 0 Astronomy: Study of the universe Stars can be imagined to be on inside of celestial sphere; useful for describing location. Plane of Earth s orbit around Sun is ecliptic, at 23.5º to celestial equator. Angle of Earth s axis causes seasons. Moon shines by reflected light, has phases. Solar day sidereal day, due to Earth s revolution around Sun.

30 Summary of Chapter 0 (con t) Synodic (i.e. calendar) month sidereal month, also due to Earth s revolution (in orbit) around Sun. Because the Earth moves (revolves around the Sun) the Sun appears to be in different zodiac constellations at different times of the year. Eclipses of Sun and Moon only occur occasionally as orbits are not in same plane. Scientific method: Observation, theory, prediction, observation

### Chapter 0 2/19/2014. Lecture Outline. 0.1 The Obvious View. Charting the Heavens. 0.1 The Obvious View. 0.1 The Obvious View. Units of Chapter 0

Lecture Outline Chapter 0 Charting the Heavens Earth is average we don t occupy any special place in the universe Universe: Totality of all space, time, matter, and energy Astronomy: Study of the universe

### Dr. Tariq Al-Abdullah

1 Chapter 1 Charting the Heavens The Foundations of Astronomy 2 Learning Goals: 1. Our Place in Space 2. The Obvious view 3. Earth s Orbital Motion 4. The Motion of the Moon 5. The Measurement of Distance

### Knowing the Heavens. Chapter Two. Guiding Questions. Naked-eye (unaided-eye) astronomy had an important place in ancient civilizations

Knowing the Heavens Chapter Two 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

### 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

### Discovering the Night Sky

Guiding Questions Discovering the Night Sky 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

### 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

### 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

### 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

### 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:

### 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

### 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

### The. Astronomy is full of cycles. Like the day, the month, & the year In this section we will try to understand these cycles.

Understanding The Sky Astronomy is full of cycles Like the day, the month, & the year In this section we will try to understand these cycles. For Example Why do we think of stars as nighttime objects?

### Introduction to Astronomy

Introduction to Astronomy AST0111-3 (Astronomía) Semester 2014B Prof. Thomas H. Puzia Theme Our Sky 1. Celestial Sphere 2. Diurnal Movement 3. Annual Movement 4. Lunar Movement 5. The Seasons 6. Eclipses

### 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

### Chapter S1 Lecture. The Cosmic Perspective Seventh Edition. Celestial Timekeeping and Navigation Pearson Education, Inc.

Chapter S1 Lecture The Cosmic Perspective Seventh Edition Celestial Timekeeping and Navigation 2014 Pearson Education, Inc. Celestial Timekeeping and Navigation 2014 Pearson Education, Inc. S1.1 Astronomical

### 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

### 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

### Astronomy 122 Section 1 TR Outline. The Earth is Rotating. Question Digital Computer Laboratory

Astronomy 122 Section 1 TR 1300-1350 Outline 1320 Digital Computer Laboratory Leslie Looney Phone: 244-3615 Email: lwlw@wuiucw. wedu Office: Astro Building #218 Office Hours: T 10:30-11:30 a.m. or by appointment

### James T. Shipman Jerry D. Wilson Charles A. Higgins, Jr. Chapter 15 Place and Time

James T. Shipman Jerry D. Wilson Charles A. Higgins, Jr. Chapter 15 Place and Time Place & Time Read sections 15.5 and 15.6, but ignore the math. Concentrate on those sections that help explain the slides.

### 2. Modern: A constellation is a region in the sky. Every object in the sky, whether we can see it or not, is part of a constellation.

6/14 10. Star Cluster size about 10 14 to 10 17 m importance: where stars are born composed of stars. 11. Galaxy size about 10 21 m importance: provide a stable environment for stars. Composed of stars.

### 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?!

### 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

### 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

### Astronomy is the oldest science! Eclipses. In ancient times the sky was not well understood! Bad Omens? Comets

Astronomy is the oldest science! In ancient times the sky was not well understood! Eclipses Bad Omens? Comets 1 The Ancient Greeks The Scientific Method Our ideas must always be consistent with our observations!

### 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.)

### 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

### Observing the Universe for Yourself

Observing the Universe for Yourself Figure 6-20 Solar-System Formation What does the universe look like from Earth? With the naked eye, we can see more than 2,000 stars as well as the Milky Way. A constellation

### 6/17. Universe from Smallest to Largest:

6/17 Universe from Smallest to Largest: 1. Quarks and Leptons fundamental building blocks of the universe size about 0 (?) importance: quarks combine together to form neutrons and protons. One of the leptons

### Appearance of the Sky Orientation Motion of sky Seasons Precession (?)

Today Appearance of the Sky Orientation Motion of sky Seasons Precession (?) The Celestial Sphere Stars at different distances all appear to lie on the celestial sphere. The ecliptic is the Sun s apparent

### Summary Sheet #1 for Astronomy Main Lesson

Summary Sheet #1 for Astronomy Main Lesson From our perspective on earth The earth appears flat. We can see half the celestial sphere at any time. The earth s axis is always perpendicular to the equator.

### 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

### Today in Space News: Earth s oldest rock found on the Moon.

Today in Space News: Earth s oldest rock found on the Moon https://www.lpi.usra.edu/features/012419/oldest-rock/ Study Points Predict the approximate time of day/night you should look for first quarter

### Chapter 1 Image Slides. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Chapter 1 Image Slides Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. CH. 1: CYCLES OF THE SKY CO a 1.1 The Celestial Sphere CO b The nearest star to us is about

### 10/17/2012. Observing the Sky. Lecture 8. Chapter 2 Opener

Observing the Sky Lecture 8 Chapter 2 Opener 1 Figure 2.1 Figure 2.2 2 Figure 2.6 Figure 2.4 Annotated 3 The Celestial Sphere The celestial sphere is the vast hollow sphere on which the stars appear fixed.

### Time, coordinates and how the Sun and Moon move in the sky

Time, coordinates and how the Sun and Moon move in the sky Using the colors and magnitudes of quasars drawn from the SDSS Catalog Archive Server to distinguish quasars from stars using the light they emit

### PHYS 160 Astronomy Test #1 Fall 2017 Version B

PHYS 160 Astronomy Test #1 Fall 2017 Version B 1 I. True/False (1 point each) Circle the T if the statement is true, or F if the statement is false on your answer sheet. 1. An object has the same weight,

### 2. Knowing the Heavens

2. Knowing the Heavens Ancient naked-eye astronomy Eighty-eight constellations The sky s ever-changing appearance The celestial sphere Celestial coordinates Seasons: Earth s axial tilt Precession of Earth

### Astronomy 101: 9/18/2008

Astronomy 101: 9/18/2008 Announcements Pick up a golf ball at the front of the class or get one from Alex; you will need it for an in-class activity today. You will also need the question sheet from Alex.

### The Sun-Earth-Moon System

Name The Sun-Earth-Moon System Section 28.3 The Sun-Earth-Moon System Date Main Idea Details Read the title of Section 3. List three things that might be discussed in this section. 1. 2. 3. Review Vocabulary

### Appearance of the Sky Orientation Motion of sky Seasons Precession (?)

Today Appearance of the Sky Orientation Motion of sky Seasons Precession (?) The Celestial Sphere Stars at different distances all appear to lie on the celestial sphere. The ecliptic is the Sun s apparent

### A2 Principi di Astrofisica. Coordinate Celesti

A2 Principi di Astrofisica Coordinate Celesti ESO La Silla Tel. 3.6m Celestial Sphere Our lack of depth perception when we look into space creates the illusion that Earth is surrounded by a celestial sphere.

Academic Year 2017-2018 Second Term Science Revision Sheet Grade 6 Name: Grade Date: Section: Part A. Science Practice. Circle the letter of your answer. 1. When the moon is waxing, its lighted part appears

### Chapter 2 Discovering the Universe for Yourself. Copyright 2012 Pearson Education, Inc.

Chapter 2 Discovering the Universe for Yourself 1 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

### 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

### Solar Noon The point at which the Sun is highest in the sky (and when shadows are shortest).

Solar Noon The point at which the Sun is highest in the sky (and when shadows are shortest). Rotation The movement of one object as it turns or spins around a central point or axis. Revolution The movement

### The Celestial Sphere. Chapter 1. Constellations. Models and Science. Constellations. Diurnal vs. Annular Motion 9/16/2010

The Celestial Sphere Chapter 1 Cycles of the Sky 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

### 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

### 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

### The Earth, Moon, and Sky. Lecture 5 1/31/2017

The Earth, Moon, and Sky Lecture 5 1/31/2017 From Last Time: Stable Orbits The type of orbit depends on the initial speed of the object Stable orbits are either circular or elliptical. Too slow and gravity

### 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

### 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

### TAKEN FROM HORIZONS 7TH EDITION CHAPTER 3 TUTORIAL QUIZ

TAKEN FROM HORIZONS 7TH EDITION CHAPTER 3 TUTORIAL QUIZ 1. When Neap tides are occurring, a. a person experiences the lowest tides close to sunset and sunrise. b. the Sun and the Moon are separated by

### 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

### Astronomy 115 Section 4 Week 2. Adam Fries SF State

Astronomy 115 Section 4 Week 2 Adam Fries SF State afries@sfsu.edu Important Notes: Homework #1 is Due at the beginning of class next time. Attendance Sheet is going around one last time! Homework Questions?

### The sky and the celestial sphere

Chapter 1 The sky and the celestial sphere The Sun, and sometimes the Moon are, by and large, the only astronomical objects visible in the day sky. Traditionally, astronomy has been a nocturnal activity.

### Motions of the Earth

Motions of the Earth Our goals for learning: What are the main motions of the Earth in space? How do we see these motions on the ground? How does it affect our lives? How does the orientation of Earth's

### Oberth: Energy vs. Momentum

1 2 The Oberth Effect 3 Oberth: Energy vs. Momentum 4 The Celestial Sphere From our perspective on Earth the stars appear embedded on a distant 2-dimensional surface the Celestial Sphere. 5 The Celestial

### Tools of Astronomy Tools of Astronomy

Tools of Astronomy Tools of Astronomy The light that comes to Earth from distant objects is the best tool that astronomers can use to learn about the universe. In most cases, there is no other way to study

### UNIT 3: EARTH S MOTIONS

UNIT 3: EARTH S MOTIONS After Unit 3 you should be able to: o Differentiate between rotation and revolution of the Earth o Apply the rates of rotation and revolution to basic problems o Recall the evidence

### PHAS 1511: Foundations of Astronomy

PHAS 1511: Foundations of Astronomy Dr Roger Wesson Research interests: deaths of stars. Planetary nebulae, novae and supernovae. Astronomy: some maths You can see that distances in astronomy are huge.

### It s Full of Stars! Outline. A Sky Full of Stars. Astronomy 210. lights), about how many stars can we see with

Astronomy 210 Section 1 MWF 1500-1550 134 Astronomy Building Leslie Looney Phone: 244-3615 Email: lwlw@wuiucw. wedu Office: Astro Building #218 Office Hours: MTF 10:30-11:30 a.m. or by appointment This

### A User s Guide to the Sky

A User s Guide to the Sky Constellations Betelgeuse Rigel Stars are named by a Greek letter ( ) according to their relative brightness within a given constellation plus the possessive form of the name

### Day, Night, Year, and Seasons

Welcome Astronomers to the Sun, Moon, and Earth! The relationship between the Sun, Moon, and Earth is very important to the existence of life on Earth. Our quest is to find out how their relationships

### 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

### HNRS 227 Fall 2007 Chapter 14. Earth in Space presented by Prof. Geller 25 October 2007

HNRS 227 Fall 2007 Chapter 14 Earth in Space presented by Prof. Geller 25 October 2007 Key Points of Chapter 14 Shape, Size and Motions of the Earth Rotation and Revolution Precession Coordinate Systems

### Using Angles. Looking at the Night Sky. Rising and Setting Stars. Nightly Motion of the Stars. Nightly Motion of the Stars

Looking at the Night Sky How to find your way around: Position -> where is that object? Distance -> how much space between these two things? Motion -> where will that object be later tonight? Bright/faint

### Earth s Motion. Lesson Outline LESSON 1. A. Earth and the Sun 1. The diameter is more than 100 times greater than

Lesson Outline Earth s Motion LESSON 1 A. Earth and the Sun 1. The diameter is more than 100 times greater than Earth s diameter. a. In the Sun, atoms combine during, producing huge amounts of energy.

### 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

### Day, Night & the Seasons. Lecture 2 1/15/2013

Day, Night & the Seasons Lecture 2 1/15/2013 Logistics The following students see me after class: Dahms, Doyle, Kavalle, Jennings, Melton, Polsky, Soriano, Augustinovich, Briggs Anyone who was not here

### Earth, Sun, and Stars

Earth, Sun, and Stars Daily Patterns Earth Spins Earth is always moving, even though you don t feel it. One way Earth moves is by spinning around an imaginary line. One end of the line would come out of

### 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 b. Explain the alignment of the earth, moon, and sun during solar and lunar eclipses. c. Relate the

### Lunar Eclipse Wednesday (January 31 st ) Morning. Topics for Today s Class. PHYS 1403 Stars and Galaxies

PHYS 1403 Stars and Galaxies Lunar Eclipse Wednesday (January 31 st ) Morning Super Moon so visible with naked eye Look in the western horizon Penumbral eclipse starts at 5:00 am Totality begins at 7:00

### Astronomy 122 Section 1 TR Digital Computer Laboratory. Outline. Celestial Sphere. Motions in the Sky

Astronomy 122 Section 1 TR 1300-1350 1320 Digital Computer Laboratory Leslie Looney Phone: 244-3615 Email: lwlw@wuiucw. wedu Office: Astro Building #218 Office Hours: T 10:30-11:30 a.m. or by appointment

### Astr 1050 Mon. Jan. 31, 2017

Astr 1050 Mon. Jan. 31, 2017 Finish Ch. 2: Eclipses & Planetary Motion Seasons Angular Size formula Eclipses Planetary Motion Reading: For Today: Finish Chapter 2 For Monday: Start Chapter 3 Homework on

### Chapter 2 Lecture. The Cosmic Perspective Seventh Edition. Discovering the Universe for Yourself Pearson Education, Inc.

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

### 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

### Brock University. Test 1, October 2016 Number of pages: 9 Course: ASTR 1P01 Number of Students: 500 Date of Examination: October 3, 2016

Brock University Test 1, October 2016 Number of pages: 9 Course: ASTR 1P01 Number of Students: 500 Date of Examination: October 3, 2016 Number of hours: 50 min Time of Examination: 17:00 17:50 Instructor:

### Guiding Questions. Discovering the Night Sky. iclicker Qustion

Guiding Questions Discovering the Night Sky 1 1. What methods do scientists use to expand our understanding of the universe? 2. What makes up our solar system? 3. What are the stars? Do they last forever?

### The Nature of Stars. The Nature of Stars

The Nature of Stars The total number of stars is beyond our ability to count Only a few stars have been studied in detail. To understand the nature of stars, we will compare and catalog the stars by: Physical

### Alien Skies. Todd Timberlake

Alien Skies Todd Timberlake Have you ever wanted to send your students to another planet? What would they see while looking up at the skies from their new home? Would they be able to interpret what they

### 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

### Name: Exam 1, 9/30/05

Multiple Choice: Select the choice that best answers each question. Write your choice in the blank next to each number. (2 points each) 1. At the North Pole in mid-november, the sun rises at a. North of

### Seasons. What causes the seasons?

Questions: Seasons What causes the seasons? How do we mark the progression of the seasons? What is the seasonal motion of the sun in the sky? What could cause the seasonal motion of the sun to change over

### Astronomical coordinate systems. ASTR320 Monday January 22, 2018

Astronomical coordinate systems ASTR320 Monday January 22, 2018 Special public talk this week: Mike Brown, Pluto Killer Wednesday at 7:30pm in MPHY204 Other news Munnerlyn lab is hiring student engineers

### Practice Questions: Seasons #1

1. Seasonal changes on Earth are primarily caused by the A) parallelism of the Sun's axis as the Sun revolves around Earth B) changes in distance between Earth and the Sun C) elliptical shape of Earth's

### Brock University. Test 1, September 2014 Number of pages: 9 Course: ASTR 1P01 Number of Students: 500 Date of Examination: September 29, 2014

Brock University Test 1, September 2014 Number of pages: 9 Course: ASTR 1P01 Number of Students: 500 Date of Examination: September 29, 2014 Number of hours: 50 min Time of Examination: 18:00 18:50 Instructor:

### Discovering the Universe

Discovering the Universe Astronomy and human culture have always been intertwined Astronomical events have defined the cycles of human life They have inspired great religion stories The scientific revolution

### Astronomy AST-1002 Section 0459 Discover the Universe Fall 2017

Astronomy AST-1002 Section 0459 Discover the Universe Fall 2017 Instructor: Dr. Francisco Reyes Web Page: http://www.astro.ufl.edu/~freyes/classes/ast1002/index.htm Textbook: Astronomy: A Beginners Guide

### The Cause of the Seasons

The Cause of the Seasons Summer Winter Seasons are caused by the Earth s axis tilt, not the distance from the Earth to the Sun! Axis tilt changes directness of sunlight during the year. Why Does Flux Sunlight

### ClassAction: Coordinates and Motions Module Instructor s Manual

ClassAction: Coordinates and Motions Module Instructor s Manual Table of Contents Section 1: Warm-up Questions...3 The Sun s Path 1 4 Section 2: General Questions...5 Sledding or Going to the Beach...6

### Discovering the Universe for Yourself

Constellations: region in the sky with well defined borders; the familiar patterns of stars merely help us locate these constellations. 88 names were chosen by the International Astronomical Union. Every

### Name: Date: 5. The bright stars Vega, Deneb, and Altair form A) the summer triangle. B) the winter triangle. C) the Big Dipper. D) Orion, the Hunter.

Name: Date: 1. If there are about 6000 stars in the entire sky that can be seen by the unaided human eye, about how many stars would be seen at a particular instant on a given dark night from a single

### 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

### Tilted Earth Lab Why Do We Have Seasons?

Name Class Tilted Earth Lab Why Do We Have Seasons? Purpose: In this investigation, you are going to figure out how the axis (or tilt) of the Earth, combined with the revolution (orbit) of Earth around

### Lecture 2 Motions in the Sky September 10, 2018

1 Lecture 2 Motions in the Sky September 10, 2018 2 What is your year in school? A. New freshman B. Returning freshman C. Sophomore D. Junior E. Senior F. I ve been here, like, forever 3 What is your major?

### Chapter 3: Cycles of the Sky

Chapter 3: Cycles of the Sky Motions of the Planets Mercury Venus Earth All planets in almost circular (elliptical) orbits around the sun, in approx. the same plane, the ecliptic plane. The Moon is orbiting

### 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

### Astronomy 103: First Exam

Name: Astronomy 103: First Exam Stephen Lepp September 21, 2010 Each question is worth 2 points. Write your name on this exam and on the scantron. Short Answer Mercury What is the closest Planet to the