Solar day and sidereal day

  • Thread starter Carolyn
  • Start date
37
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I know that a solar day is about 4 minutes longer than a sidereal day.

But what if the earth orbital period around the sun is halved, but the rotation period is same?

Will the solar day still be about 4 minutes longer?

Thanks.
 

mgb_phys

Science Advisor
Homework Helper
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The 4minutes is to account for the distance accross the sky the sun moves in a day.
So it takes 23:56 min for the earth to rotate but then you have to move another 4mins to catch up with the sun which has moved on a bit.
If the earht moved twice as fast around the sun, the sun would have moved twice as far and so you would need (roughly) an extra 8 minutes to catch up and a solar day would 24:04.
 
37
0
this makes sense, thanks.
 

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