Guided Notes Astronomy. Earth s Moon Formation Orbit Craters Motions Phases Tides Eclipses

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1 Guided Notes Astronomy Earth s Moon Formation Orbit Craters Motions Phases Tides Eclipses K. Coder 2015

2 1. What is the Moon? The Moon: the Earth's only natural satellite. See ESRT page 15 for data on Earth s Moon. o Satellite: an object in space that revolves around another object due to gravity K. Coder 2015

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4 2. How did the Moon form? Giant Impact Hypothesis: the Moon was created from debris left over from a collision between young Earth and a Mars-sized body approximately 4.5 billion years ago. K. Coder 2015

5 3. How does the Moon orbit the Earth? The Moon revolves around the Earth in an elliptical (oval) orbit with the Earth at one focus. Perihelion: Moon is closest to Earth Aphelion: Moon is farthest from Earth

6 3. How does the Moon orbit the Earth? Evidence: The apparent diameter of the Moon changes. o Photographs A: Moon appears smaller during Aphelion o Photograph B: Moon appears larger during Perihelion

7 4. Why are there so many craters on the Moon (and other planets) but not on Earth? K. Coder 2015

8 4. Why are there so many craters on the Moon (and other planets) but not on Earth? Earth has a hydrosphere (water) & atmosphere (gases). o The Earth s atmosphere allows it to have weather like wind, rain, and snow. All factors that lead to erosion and weathering, which wear away any craters on Earth.

9 4. Why are there so many craters on the Moon (and other planets) but not on Earth? The Moon (and other small planets) have lost their atmosphere because they are smaller and have less gravity. K. Coder 2015

10 5. Why do we always see the same side of the moon? We always see this side. We never see this side! K. Coder 2015

11 5. Why do we always see the same side of the moon? The moon s period of rotation (27.3 days) is equal to the moon s period of revolution (27.3 days). See ESRT page 15. Synchronous Rotation Animations: Animation03-02.htm

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13 6. Why does the Moon appear differently on different days? Phases of the moon: the observed shape of the lighted portion of the Moon

14 6. Why does the Moon appear differently on different days? Caused by the Moon s revolution around the Earth which causes the amount of the lit half of the Moon visible to observers on Earth to change. A complete cycle of phases takes 29.5 days (one moonth") The phases of the Moon are cyclic and predictable because they repeat in a pattern.

15 7. Why is the Moon s period of revolution not the same as the amount of time it takes to view one full cycle of Moon phases? As the Moon is orbiting the Earth, the Earth is orbiting the Sun. Thus, it takes 2.2 more days for the Moon to reach the same position in relation to the Earth and the Sun. K. Coder 2015

16 Stop! Go back to packet for next steps

17 8. How can you determine the phase of the Moon as viewed from Earth using a diagram of the Moon-Earth-Sun as viewed from space? The diagram below represents the Moon at eight numbered positions in its orbit around Earth. The nighttime sides of the Moon and Earth are shaded.

18 K. Coder 2015

19 Here is what you re actually seeing One half of the Moon and the Earth is always illuminated. The other half (facing away from the Sun) is always dark. Because the Moon s position relative to Earth changes, the amount of lighted Moon we see also changes. North Pole Moon in 8 orbit positions around the Earth. It takes about 3.5 days for the Moon to move from one position to the next. Direction the Sun is coming from K. Coder 2015

20 View from Space Completely dark Steps to determine the Phase of the Moon: 1. Draw an arrow from the observer on Earth s North Pole to the selected position. 2. Turn your paper so that the arrow is pointed directly away from you. 3. Block the far half of the moon. 4. Draw the amount of light and dark you see on the same side as you view it. K. Coder 2015

21 View from Space Mostly dark on left, a little light on right Steps to determine the Phase of the Moon: 1. Draw an arrow from the observer on Earth s North Pole to the selected position. 2. Turn your paper so that the arrow is pointed directly away from you. 3. Block the far half of the moon. 4. Draw the amount of light and dark you see on the same side as you view it. K. Coder 2015 Follow the same steps and complete the rest of the moon phases in your packet.

22 Practice #1 New Moon 1 st Quarter Full Moon 3 rd Quarter Answer in Packet

23 Locations of Major Phases: 1 The New Moon will always be directly between the Earth and Sun. 2 The Full Moon will always be on the opposite side of Earth than the Sun. 3 First quarter and third quarter are always at a right angle to the Earth and Sun.

24 Here is another perspective with Sunlight coming from the right Direction the Sun is coming from K. Coder 2015 Notice the same phase occurs in the same position, relative to the Earth and Sun.

25 9. How does the Moon affect our oceans? Tides: cyclic rise and fall of sea level under gravitational pull

26 9. How does the Moon affect our oceans? o Caused by the pull of the Moon s gravity and the Sun s gravity on the Earth The Moon has more of an effect on the tides because it is closer to Earth. K. Coder 2015

27 10. How often do the tides change? Each day, all coastal locations experience 2 high tides and 2 low tides. Lunar Day Animation o One high tide to the next high tide takes 12 hours and 26 minutes (or from one low tide to the next low tide). o One high tide to the next low tide (or vice-versa) takes 6 hours and 13 minutes.

28 11. How can you plot a tidal change graph? Based on the tidal information, at what time will the next low tide and high tide occur on November 27? Low tide: High tide:

29 12. Why does the height of the tide change throughout the month? Spring Tides: highest high tides and lowest low tides Highest High Tide Lowest Low Tide K. Coder 2015

30 Mont St. Michel Spring Tides K. Coder 2015

31 Mont St. Michel Spring Tides K. Coder 2015

32 Mont St. Michel Spring Tides

33 Mont St. Michel Spring Tides K. Coder 2015

34 12. Why does the height of the tide change throughout the month? o Occurs when Earth, Sun and Moon are in a straight line (during New and Full Moons) Spring Tides = Strong = Straight Full Moon New Moon K. Coder 2015

35 12. Why does the height of the tide change throughout the month? Neap Tides: lowest high tides and highest low tides Lowest High Tide Highest Low Tide

36 12. Why does the height of the tide change throughout the month? o Occurs when Earth, Sun, and Moon are at a 90 angle (1 st and 3 rd Quarter Moons) Neap Tides = Not Strong = Ninety Degree Angle 1 st Quarter 3 rd Quarter K. Coder 2015

37 13. Why are there eclipses? Eclipse: an object is blocked from view

38 13. Why are there eclipses? o Solar Eclipse: Cannot see the Sun Occurs when Moon is directly between the Sun and Earth (New Moon) Can only see on the daylight side of Earth

39 13. Why are there eclipses? o Lunar Eclipse: Cannot see the Moon Occurs when Earth is directly between the Sun and Moon (Full Moon) Can only see on the nighttime side of Earth K. Coder 2015

40 14. Why aren t there eclipses each month during the Full Moon and New Moon? The Moon orbit around the Earth at a 5 incline.

41 Practice #2 in Packet

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