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Quiz 3

Quiz 3. 1. Not graded. 2. In the following image, where would you need to be in order to see the sun at your zenith during the day? 1. Anywhere along the Tropic of Cancer 2. Anywhere along the equator 3. At the south pole 4. At the north pole 5. Anywhere along the

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Quiz 3

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  1. Quiz 3

  2. 1. • Not graded.

  3. 2. • In the following image, where would you need to be in order to see the sun at your zenith during the day? 1. Anywhere along the Tropic of Cancer2. Anywhere along the equator3. At the south pole4. At the north pole5. Anywhere along the Tropic of Capricorn

  4. 2. • In the following image, where would you need to be in order to see the sun at your zenith during the day? 1. Anywhere along the Tropic of Cancer2. Anywhere along the equator3. At the south pole4. At the north pole5. Anywhere along the Tropic of Capricorn

  5. To find an observer’s zenith, draw a line perpendicular to Earth’s surface and extend it out into space. (Or, draw a line from the center of Earth, through the observer, and then extend the line out into space.) The observer indicated with a yellow dot is at a latitude that corresponds to the Tropic of Capricorn, and his local time is noon. If he points along his zenith, he will point directly at the sun. Zenith

  6. Related Questions • On the day indicated in the previous image, would a person who was on the Arctic Circle ever say that the sun is at his zenith? • On the day indicated in the previous image, would a person who was on the Equator ever say that the sun is at his zenith? • What is the month corresponding to the previous image?

  7. 3. • If you were standing at a location along the Tropic of Cancer at noon on December 21st, how would you describe the position of the sun in the sky? Note that the image used in the previous problem is for December 21st.1. Towards the south2. Towards the north3. Exactly at my zenith

  8. 3. • If you were standing at a location along the Tropic of Cancer at noon on December 21st, how would you describe the position of the sun in the sky? Note that the image used in the previous problem is for December 21st.1. Towards the south2. Towards the north3. Exactly at my zenith

  9. The white line is the zenith for a person on the Tropic of Cancer at a local time of noon. If the observer was looking along his zenith, he would need to look southward in the sky to see the sun. Zenith

  10. Related Questions • Two months after the date corresponding to the previous image and at noon, in what direction would a person on the Tropic of Capricorn say the sun is? North? South?

  11. 4. • If you live in the Arctic Circle, on June 21st, the sun will never set. On that day, will the sun reach your zenith at noon? 1. No, because the sun's rays still strike Earth's surface at an angle2. Yes, just because.

  12. 4. • If you live in the Arctic Circle, on June 21st, the sun will never set. On that day, will the sun reach your zenith at noon? 1. No, because the sun's rays still strike Earth's surface at an angle2. Yes, just because.

  13. Zenith for two observers, one on and one in the Arctic Circle. In both cases, the zenith does not point directly at the sun.

  14. Related Questions • Which observer on the previous image would see the sun higher in the sky at noon?

  15. 5. • From the perspective of someone on Earth what position of A-E best fits the Moon view in the lower-left-hand corner? Note that in this image the sun is to the right. 1. C2. B3. A4. E5. D

  16. 5. • From the perspective of someone on Earth what position of A-E best fits the Moon view in the lower-left-hand corner? Note that in this image the sun is to the right. 1. C2. B3. A4. E5. D

  17. At I, a person on Earth says that the left side of the moon is sunlit. At F, a person on Earth says that no part of the moon is sunlit. Between I and F, the part that is sunlit must have shrunk. G Sun’s rays F H Earth I

  18. 6. • Suppose that you live on the equator. At noon, will you ever see a full moon?1. Only at equinox2. Yes3. Only at solstice4. No

  19. 6. • Suppose that you live on the equator. At noon, will you ever see a full moon? 1. Only at equinox2. Yes3. Only at solstice4. No

  20. 1st quarter moon. Full moon Yellow dot is observer. View from above the north pole. Sun is to the right. Sunlight falls on the white parts. 1st quarter moon is first visible at noon. Full moon is not visible at noon (can’t draw line to it without hitting Earth).

  21. 7. • From Earth, the entire side of the moon THAT WE CAN SEE is illuminated on the day of the full moon. How much of the moon's TOTAL surface is actually illuminated by the sun?1. 50%2. 25%3. 100%4. 75%

  22. 7. • From Earth, the entire side of the moon THAT WE CAN SEE is illuminated on the day of the full moon. How much of the moon's TOTAL surface is actually illuminated by the sun?1. 50%2. 25%3. 100%4. 75% Half of the moons surface is (almost) always illuminated by the sun. At new moon, we see the half that is not illuminated. At full moon, we see the half that is illuminated.

  23. Related Questions • During a total solar eclipse, how much of the moon’s surface is illuminated by the sun? • During a total lunar eclipse, how much of the moon’s surface is directly illuminated by the sun?

  24. 8. • A simple model of the Moon is that it orbits in Earth's ecliptic plane and that its orbit is a perfect circle. If this were true, which of the following would we expect?1. We would never see the third quarter moon.2. One eclipse per year.3. An eclipse every month.4. We would never see the first quarter moon.

  25. 8. • A simple model of the Moon is that it orbits in Earth's ecliptic plane and that its orbit is a perfect circle. If this were true, which of the following would we expect?1. We would never see the third quarter moon.2. One eclipse per year.3. An eclipse every month.4. We would never see the first quarter moon.

  26. 9. • What is the difference between an annular and total eclipse?1. During a total eclipse, the sun is not on the line of nodes.2. During an annular eclipse, the moon is closer to Earth.3. During a total eclipse, the moon is farther from Earth.4. During an annular eclipse, the full disk of the sun is not covered. During a total eclipse the full disk of the sun is covered and all we see is the faint corona. The moon is a bit further from Earth during an annular eclipse.

  27. 9. • What is the difference between an annular and total eclipse?1. During a total eclipse, the sun is not on the line of nodes.2. During an annular eclipse, the moon is closer to Earth.3. During a total eclipse, the moon is farther from Earth.4. During an annular eclipse, the full disk of the sun is not covered. During a total eclipse the full disk of the sun is covered and all we see is the faint corona. The moon is a bit further from Earth during an annular eclipse.

  28. Related Questions • If the moon orbited the earth in a perfect circle, would the time between annular and total eclipses increase, decrease, or stay the same.

  29. 10. • Why don't we see a solar eclipse (either total or annular) every month?1. Because the same side of the moon always faces Earth.2. Because the moon does not move in a circular orbit.3. Because the moon casts an umbral and penumbral shadow.4. Because the moon moves in a circular orbit.5. Because Earth does not move in a circular orbit around the sun.6. Because the moon orbits Earth in a plane that is slightly tilted to the ecliptic plane.

  30. 10. • Why don't we see a solar eclipse (either total or annular) every month?1. Because the same side of the moon always faces Earth.2. Because the moon does not move in a circular orbit.3. Because the moon casts an umbral and penumbral shadow.4. Because the moon moves in a circular orbit.5. Because Earth does not move in a circular orbit around the sun.6. Because the moon orbits Earth in a plane that is slightly tilted to the ecliptic plane.

  31. 11. • Are the moon's phases caused by Earth casting a shadow on the moon?1. No. This is a common misconception.2. Yes

  32. Related Questions • Does the Earth ever cast a shadow on the moon?

  33. 12. • On the day that someone on Earth says it is a full moon, what will a person on the moon say when they look at Earth?1. About one-quarter of the part of Earth that I can see is sunlit.2. About three-quarters of the part of Earth that I can see is sunlit.3. About half of the part of Earth that I can see is sunlit.4. Almost all of the part of Earth that I see is dark.5. Almost all of the part of Earth that I can see is sunlit.

  34. 12. • On the day that someone on Earth says it is a full moon, what will a person on the moon say when they look at Earth?1. About one-quarter of the part of Earth that I can see is sunlit.2. About three-quarters of the part of Earth that I can see is sunlit.3. About half of the part of Earth that I can see is sunlit.4. Almost all of the part of Earth that I see is dark.5. Almost all of the part of Earth that I can see is sunlit.

  35. Full moon. Sun is far to the right. Yellow dot is observer.

  36. Related Questions • The following is a typical sketch that we use to show such things as when someone will first be able to see the full moon. Why is the right half of the moon illuminated even though as drawn all of the Sun’s rays would be blocked by Earth? Full moon. Sun is far to the right.

  37. 13. • From the perspective of someone on Earth, the moon exhibits synchronous rotation. This means that the same face of the moon is always facing Earth.From the perspective of the sun, will the same face of the moon always face the sun? That is, will someone on the sun always see the same side of the moon?1. No 2. Yes

  38. 13. • From the perspective of someone on Earth, the moon exhibits synchronous rotation. This means that the same face of the moon is always facing Earth.From the perspective of the sun, will the same face of the moon always face the sun? That is, will someone on the sun always see the same side of the moon?1. No 2. Yes

  39. At A, a person on the sun cannot see the red spot on the moon. At D, they can see the red spot. B A D C

  40. Related Questions • At D, wouldn’t the Earth be blocking the moon from view of the sun? • How often would a person on the red dot on the moon say that the sun is at his zenith?

  41. 14. • How often does a person on the equator see a full moon? 1. At new moon2. Once per month3. Never4. The Moon is always full5. Twice per month

  42. 14. • How often does a person on the equator see a full moon? 1. At new moon2. Once per month3. Never4. The Moon is always full5. Twice per month

  43. Related Questions • If you lived on the Tropic of Capricorn, would your answer to the previous question change?

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