Answers in blue

1. If the Moon is at first quarter phase, how far is it from the Sun?

a. 0 deg.
b. 45 deg.
c. 90 deg.
d. 135 deg.
e. 180 deg.

2. Eudoxus' scheme of homocentric spheres explained which of the following about planetary motion?

a. Superior planets make retrograde loops.
b. Planets are brightest when in retrograde.
c. Superior planets are at opposition when in retrograde.
d. All of the above.
e. None of the above.

3. In Aristotle's cosmology, the heavens were ...

a. pure.
b. perfect.
c. eternal.
d. incorruptible.
e. All of the above.

4. Which of the following could not be observed in a Ptolemaic Universe?

a. Jupiter at opposition.
b. Venus at full phase.
c. Retrograde loops.
d. Seasons on the Earth.
e. All of the above would be possible.

5. With his telescope, Galileo observed ...

a. mountains and craters on the Moon.
b. moon orbiting Jupiter.
c. sunspots.
d. the phases of Venus.
e. All of the above.

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Last modified 6 October, 2006. © Gregory C. Sloan.