1. Give three reasons why ancient peoples carefully observed
the patterns in the night sky. K/U
2. Do the stars that make up constellations change their
position over time? How might this change the shape
of the constellation? K/U
3. Using a globe as a guide, describe where you might fi nd the
celestial sphere, celestial equator, and celestial poles. C
4. The North Celestial Pole is very close to the star shown
in Figure 9. What is its name? K/U
5. Explain why it might be benefi cial to use the geocentric
model when describing the positions and motions of the
stars in the night sky.