On a clear night when an observer in Los Angeles sees a first-quarter Moon, an observer in London would see

Question

Quizplus · Accepted Answer

The phase of the Moon is the same worldwide at any given time. The difference in location (Los Angeles vs. London) does not change the phase of the Moon an observer sees, only the time at which it is observed. Therefore, if an observer in Los Angeles sees a first-quarter Moon, an observer in London would see a first-quarter Moon as well.

On a Clear Night When an Observer in Los Angeles