Asked Jun 3, 2019

Say you take a photograph of night sky on October 1, 2018 at 11:00:00 pm. At what time you'd take another photo on October 2 in order to have all stars in exactly the same position as in the rst shot?


Expert Answer

Step 1

In class we learned a difference between solar and sidereal day - for each orbit around the Sun, a planet makes an extra rotation with respect to stars. A tropical year has 365.2422 solar days and 366.2422 sidereal days. So, first we have to find out mean sidereal day

Step 2

I have taken the photograph at 11 p.m. on 1st October. So, in order to have all stars in the same posi...


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