When someone on Earth observes the Moon in the first-quarter phase,someone on the Moon facing Earth observes Earth in the
A)new Earth phase.
B)first-quarter Earth phase.
C)crescent Earth phase.
D)third-quarter Earth phase.
E)full Earth phase.

Question

Quizplus · Accepted Answer

When someone on Earth observes the Moon in the first-quarter phase, it means the Sun, Earth, and Moon form a right angle, with the Sun on one side, Earth in the middle, and the Moon on the other side. At this point, someone on the Moon facing Earth would observe Earth in the third-quarter phase, with half of the Earth illuminated and the other half in darkness.

When Someone on Earth Observes the Moon in the First-Quarter