HW#3: pg. 30 Rev 7 – 9, CST 7 – 9
Rev 7 – 9
7. Why do we see different stars at different times of the year?
8. What is precession, and what causes it? What effect does precession have on observations of stars?
9. Why are there seasons on Earth?
CST 7 – 9
7. If the Moon orbited Earth twice as fast but in the same orbit, the frequency of solar eclipses would (a) double; (b) be cut in half; (c) stay the same.
8. In Figure 1.28 ("Triangulation"), using a longer baseline would result in (a) a less accurate distance to the tree; (b) a more accurate distance to the tree; (c) a smaller angle at point B; (d) a greater distance across the river.
9. In Figure 1.30 ("Parallax"), a smaller Earth would result in (a) a smaller parallax angle; (b) a shorter distance measured to the object; (c) a larger apparent displacement; (d) stars appearing closer together.