The local solar time at 25°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
A) 155°E
B) 65°E
C) 25°E
D) 25°W
E) None of the above

Question

Quizplus · Accepted Answer

The full moon is on the opposite side of the Earth from the sun. If the local solar time is 12:00 noon at 25°W, then the local solar time at the longitude of the observer who sees the full moon on her meridian is 00:00 midnight. The difference in longitude between the two locations is 180°, so the longitude of the observer is 180° + 25° = 205°W. However, longitudes are typically expressed in the range of 0° to 180°, so the longitude of the observer is 205°W - 180° = 25°E.

The Local Solar Time at 25°W Is 12:00 Noon