Quiz 4

1. The Moon is now in its first [waxing] quarter. How long will it be until the next full Moon?
a. About 2 days.     b. About a week.     c. About 3 weeks.     d. About 90 days.

2. What is the main reason why don't we see lunar and solar eclipses every month?
a. Because sometimes the weather is cloudy.
b. Because the Moon's orbit is tilted with respect to the Earth's orbit.
c. Because the Earth's rotation axis is tilted.
d. Because we are sometimes facing a different direction in the sky when they occur.

3. Do the stars' positions on the celestial sphere ever change over time?
a. No, stars can never move from their locations, only planets do.
b. Yes, because of the stars' motion in space, but only over many years.
c. Yes, because of the celestial sphere's rotation around its axis.
d. Yes, because of the Earth's rotation around its axis.

4. Do the planets' positions on the celestial sphere ever change over time?
a. No, planets never move from their locations, only stars rise and set.
b. Yes, they always move East to West because of the celestial sphere's rotation.
c. Yes, they always move West to East because of the Earth's rotation.
d. Yes, they slowly drift West to East except in periods of retrograde motion.

5. The current plan for makeup classes is to meet four times in the evening, from 7 to 9 pm (twice a week, Mon/Tue and Wed/Thu). Would you prefer to replace the Wed/Thu evening class by a Friday morning class?
a. Yes, Friday at the same time, 8-10 am.
b. Yes, if the Friday class was 10-12 noon.
c. No, I prefer all evening makeup classes.
d. I do not have a preference.