Name: ________________________ GIVEN 9/3 ID number: ________________________

Quiz 2. What Do You See?


The diagram at the left shows the Earth and Moon. We are looking down from a position above the Earth's North Pole, indicated by the large grey `N'. Sunlight comes from the right, illuminating half the Earth's surface and half the Moon's surface. The curving arrows on the Earth show its direction of rotation. The large arrowhead on the Moon's orbit shows the direction of its motion.

a. Suppose you are on the Earth's equator at point `a'. Where in the sky do you see the Moon? Make a sketch showing the Moon's phase. Is it waxing (growing more full) or waning (growing less full)?








b. Now suppose you are on the Moon's equator at point `b'. Where in the sky do you see the Earth? Make a sketch showing the Earth's phase. Is it waxing or waning?










Joshua E. Barnes (barnes@ifa.hawaii.edu)
Last modified: September 2, 1999
http://www.ifa.hawaii.edu/~barnes/ast110_99/quizzes/quiz2.html