homework3 - 7. If you’re viewing the sky from a location...

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Physics 20A: Introduction to Astronomy Homework assignment #3 Due October 15 1. If you’re in Irvine and you know that a total lunar eclipse is going to happen at 7 pm, in which direction would you look to see the eclipse? 2. Is it ever possible for an observer in Irvine to see a 1st-quarter moon very early in the morning, at sunrise? Explain why or why not. 3. If the moon is in a waning gibbous phase tonight, what phase will it be in two weeks from today? 4. If it’s 9 a.m. and the moon is just rising on the eastern horizon, what phase is the moon in? 5. About what time of day would a third quarter moon set? 6. From Irvine, can we see any stars that are below (south of) the celestial equator? (In other words: can we see any stars that have negative declinations?) Can we observe the South Celestial Pole from Irvine? Explain why or why not.
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Unformatted text preview: 7. If you’re viewing the sky from a location at the Earth’s equator, would you see the star Polaris rise and set? 8. If you were at the South Pole on March 21, describe what you would see in terms of the Sun’s motion across the sky. Where would the sun be, and what would it do over the course of the day? 9. Suppose the Earth’s rotation axis were magically changed so that instead of having an axis tilt of 23.5 degrees, it was set to an axis tilt of zero degrees. What would this do to the cycle of the seasons on the Earth? How would this change the relationship between the celestial equator and the ecliptic? How would this change the day/night cycle as seen by an observer at the north or south pole? 10. Polaris is the “North Star”. Why is there no such thing as an “East Star” or a “West Star”? 1...
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This note was uploaded on 11/23/2010 for the course PHYSICS PHYSICS 20 taught by Professor Aaronbarth during the Winter '10 term at UC Irvine.

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