When viewed from Earth,Venus subtends an angle of about 1 arc minute (1/60°)when it is at the closest point to Earth in its orbit.If you were watching Venus set in the west over a clear horizon (e.g.,ocean),how long would Venus take from the time it first reached the horizon to completely disappear below the horizon?
A) It would be almost instantaneous (much less than 1 second).
B) second
C) about 4 minutes
D) about 4 seconds

Question

Quizplus · Accepted Answer

The angular size of Venus is about 1 arc minute, and the Earth rotates at 15 arc minutes per minute. Therefore, it would take approximately 4 seconds for Venus to disappear below the horizon.

When Viewed from Earth,Venus Subtends an Angle of About 1