Answer the following questions:

1. What important directions and coordinate systems help you find your way around the sky?

2. Why do stars have different levels of brightness, and how does one describe their brightness as compared to one another?

3. What are constellations?

4. What is Polaris, and what is its significance in the sky?

5. Why does the Moon change its phase, how does it move, and how do these combine to create eclipses?