An observer faces the Moon from a position in the northern hemisphere and observes that the right half is illuminated and the left half is dark. What phase does the observer see?
A) waxing crescent
B) first quarter
C) third quarter
D) waning gibbous

Question

Quizplus · Accepted Answer

When the right half of the Moon is illuminated and the left half is dark, as seen from the northern hemisphere, it indicates the Moon is in its first quarter phase. This phase occurs when the Moon is 90 degrees away from the Sun in the sky, and we see exactly half of the Moon's surface illuminated.

An Observer Faces the Moon from a Position in the Northern