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Unformatted text preview: UCSB Winter 2008 Astro 1 - Homework #2 Solutions 1/23/08 2.6 If someone told me to try and land a spacecraft on the surface of the celestial sphere... I would tell them that there is no such thing as the celestial sphere, that it is just a made up notion designed to help us describe the motion of the stars as viewed from earth. (Then I would kick him in the shin.) 2.8 Where do you look to see your zenith? Where on Earth does the celestial equator pass through the zenith? Where on Earth does the south celestial pole sit on the zenith? The zenith is the point derectly above the observer (on Earth), opposite the direction to the center of the Earth, 90 degrees up from the horizon. To the see the celestial equator at the zenith you must be on Earths equator. To see a celestial pole at the zenith you must be at the corrosponding pole on Earth. 2.10 Why cant a person in Antarctica use the Big Dipper to find the north direction? The Big Dipper is on the northern hemisphere of the celestial spere, close to the north ce- lestial pole. A person near Earths South pole can only see things in the southern celestial hemisphere because the Earth (the horizon) blocks the veiw of everything else. 2.12 How do the stars appear to move over the course of the night as seen from the north pole? from the equator? Why are these different? The stars appear to move opposite to the motion of the observer. An observer looking up at the north pole is rotating (counterclockwise looking down at the north pole, or) clockwise if you are looking up from the earth in the direction of the observer, so the sky and the stars...
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