Phases of the Moon. Two perspectives: On Earth, or outside the Moon s orbit. More Phases. What if we zoom out? Phases of the Moon Demo 2/3/17
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1 Phases of the Moon The Moon goes through a set of phases about once every month Month comes from the word moon Time period of the phases (from Full Moon to Full Moon) is 29.5 days. The different phases have different names Phases of the Moon Getting larger = waxing Getting smaller = waning Less than 1/2 visible = crescent More than 1/2 visible = gibbous 1/2 visible, getting larger = 1st quarter 1/2 visible, getting smaller = 3rd quarter Entire Moon visible = Full Moon None of the Moon visible = New Moon More Phases Full 1st Quarter Waning Crescent Waxing Crescent New Waning Gibbous Two perspectives: On Earth, or outside the Moon s orbit At any time (except during lunar eclipses), 1/2 the moon is lit up Phases happen because the amount of lit up moon we can see from Earth changes What if we zoom out? Phases of the Moon Demo 1
2 Lecture Tutorial: The Cause of Moon Phases (pg ) Work with a partner! Read the instructions and questions carefully. Discuss the concepts and your answers with one another. Come to a consensus answer you all agree on. If you get stuck or are not sure of your answer, ask another group. If you get really stuck or don t understand what the Lecture Tutorial is asking, ask me for help. Moon Rise & Set Times Moon s orbit position determines its phase Also determines what time the Moon is up in the sky Moon Rise & Set Times: Examples New Moon: Same side as the Sun Rises at sunrise, sets at sunset Eclipses The cutting off of all or part of the light of one body by another Rare events when light from the Sun or Moon is blocked for a short time Eclipses occur when the Sun, Moon, and Earth are lined up just right Full Moon : Opposite the Sun Rises at sunset, sets at sunrise Lunar Eclipses The Moon gets darker as it passes into Earth s shadow Sometimes glows with a slightly reddish color at the middle of the eclipse The Moon is always in the Full phase during a lunar eclipse The next one is on Aug. 7, but only partial and not visible from North America (our next one is Jan. 31, 2018) A Lunar Eclipse Several pictures of a total lunar eclipse The moon gets eaten up by Earth s shadow Sometimes glows with light bent through Earth s atmosphere 2
3 What s going on during a lunar eclipse Solar Eclipses The Sun disappears behind the Moon The Moon is always in the New phase during a solar eclipse Can only be seen from certain places on Earth These events are even more rare than lunar eclipses Next solar eclipse is Feb. 26, but only visible from South America, Africa, and parts of Antarctica Next one visible from the USA is in August 2017 (total!) What s going on during a solar eclipse Partial, Total, and Annular Partial: Takes out a bite Total: Covers the Sun Moon slightly closer Annular: Leaves a ring Moon slightly farther away Total Solar Eclipse on March 29, 2006 (viewed from Turkey) Diamond Ring Effect This occurs when sunlight shines through a dip (usually a crater or valley) on the edge of the Moon s disk 3
4 2/3/17 Geocentric vs. Heliocentric Models of the Universe geocentric (Earth-centered) North Star Celestial Sphere heliocentric (Sun-centered) How the Greeks modeled the heavens Ancient Greek Universe Axis of Rotation Philosophical Ideas The heavens represent perfection. All heavenly bodies are perfectly formed. Spherical Unblemished Earliest mostly complete recorded attempt to explain the heavens without supernatural sources The heavens are unchanging. The circle is the perfect shape. All heavenly motions must be circular. Ancient Greek Model stars reside on celestial sphere Celestial sphere rotates once a day Sun follows path called ecliptic going around Earth once in one year ->accounts for most observations!! 4
5 But there was a complication. Some stars appeared to move across the sky without staying in a constellation WANDERING STARS Planet comes from Greek word for wanderer East West Planets were often called wandering stars because they seem to slowly move from one constellation to the next. Prograde and Retrograde Motion Prograde Motion (normal) Apparent West to East motion over many nights Retrograde Motion (irregular)- Apparent East to West motion over many nights Motions occur against backdrop of stars East South West Retrograde Motion Lecture Tutorial: Page Work with a partner or two Read directions and answer all questions carefully. Take time to understand it now! Come to a consensus answer you all agree on before moving on to the next question. If you get stuck, ask another group for help. If you get really stuck, raise your hand and I will come around. 5
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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:
Comparing the Earth and Moon
Comparing the Earth and Moon Earth and the Moon in Space (D6-D7) Together, Earth and the moon are part of the sun s planetary system. Pulled by the sun s gravity, the Earth-moon system revolves around
What is an eclipse? Lunar Eclipses. By NASA, adapted by Newsela staff on Word Count 866 Level 940L
What is an eclipse? By NASA, adapted by Newsela staff on 07.17.17 Word Count 866 Level 940L This image of the moon crossing in front of the sun was captured on January 30, 2014, by NASA's Solar Dynamics
Chapter Introduction Lesson 1 Earth s Motion Lesson 2 Earth s Moon Lesson 3 Eclipses and Tides Chapter Wrap-Up. Jason Reed/Photodisc/Getty Images
Chapter Introduction Lesson 1 Earth s Motion Lesson 2 Earth s Moon Lesson 3 Eclipses and Tides Chapter Wrap-Up Jason Reed/Photodisc/Getty Images What natural phenomena do the motions of Earth and the Moon
What is an eclipse? By NASA, adapted by Newsela staff on Word Count 786 Level 870L
What is an eclipse? By NASA, adapted by Newsela staff on 07.16.17 Word Count 786 Level 870L This image of the moon crossing in front of the sun was captured on January 30, 2014, by NASA's Solar Dynamics