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tsk tsk
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A month ago

You look at a time exposure photograph of the night sky taken in the northern hemisphere and notice that each circumpolar star traces one-eighth of a complete circle around Polaris.  What was the exposure time for the photograph?



1 hour



3 hours



4 hours



8 hours

Textbook 
ASTRO

ASTRO


Edition: 3rd
Authors:
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inhibitor128inhibitor128
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A month ago
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Good timing, thanks!
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