1. In Figure 1-8, what is another name for the “Sun’s annual path”? Figure 1-8 2. How are constellations useful to astronomers? 3. What is the celestial sphere, and why is this ancient concept still...

1. In Figure 1-8, what is another name for the “Sun’s annual path”?

Figure 1-8

2. How are constellations useful to astronomers?

3. What is the celestial sphere, and why is this ancient concept still useful today?

4. What is the ecliptic, and why is it tilted with respect to the celestial equator?