1. Why are different stars overhead at 10:00 pm on a given night than two hours later at midnight? Why are different stars overhead at midnight on June 1 than at midnight on December 1?
2. How are the north and south celestial poles related to Earth’s axis of rotation?
3. Explain why the tilt of Earth’s axis relative to Earth’s orbit causes the seasons as we orbit the Sun.
4. Explain briefly how astronomers use information from light to determine the chemical composition of stars and gas clouds (see the Ch. 1 to Ch. 3 slides posted under Announcements).

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