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doit_the_clown doit_the_clown
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When viewed from the Earth, Venus subtends an angle of about 1 arcminute (1/60°) when it is at the closest point to the Earth in its orbit.  If you were watching Venus set in the west over a clear horizon (e.g., ocean), how long would it take from the time Venus first reached the horizon to Venus completely disappearing below the horizon?
A)   Almost instantaneous (much less than 1 second)
B)   ¼ second
C)   About 4 minutes
D)   About 4 seconds
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Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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