- 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?
- How are the north and south celestial poles related to Earth’s axis of rotation?
- Explain why the tilt of Earth’s axis relative to Earth’s orbit causes the seasons as we orbit the Sun.
- 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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