Roughly how many of the constellations you chose at 9 pm will still be visible a

Science
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Roughly how many of the constellations you chose at 9 pm will still be visible above the horizon at 3 am in Atlanta, GA, the following morning? 

Mar 5th, 2015

Well, if the Earth completely rotates in 1 Earth Day by definition, in 6 hrs (9pm to 3am) it will have rotated 25%.

Since you can see approximately one hemisphere, or half the sky, at once, when the Earth rotates 25% further, half of that hemisphere will have moved below the horizon.

So approximately half of the constellations, on average, will still be visible.

Mar 5th, 2015

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