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Calculate Time For A Star To Rise

Your vessel is at the equator at midnight on 1 January, and a star is observed rising. At what time will this same star rise on 1 February, assuming your vessel's location is still at the equator?


Solution:

One should know how many hours is one sidereal day, and of course a solar day.

             1 solar day = 24hr
         1 sidereal day = 23h 56h 4s   
                                    0h  3m 56s        is the time difference
                                  x            31        since there a 31 days from Jan. 1 to Feb. 1
                                  2h 01m 56s        total difference
       Midnight 1 Jan =  - 24h 00m 00s
                                 21h 58m 04s on 1 February that the star will rise

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