The sidereal time tomorrow at 8 p.m. will be 4 hours 56 minutes .
A sidereal day is the amount of time needed by earth to complete one rotation. And the time for one sidereal day is 23 hours 56 minutes and 4.1 seconds. In the solar system , starts appear at the same location at the same time ,each sidereal day. The 4 minutes difference between the solar day and the sidereal day is visible by watching the stars rise 4 minutes earlier every night. So if any star is rising at 7p.m today , it will rise at 6:56 p.m. tomorrow and at 6:52 p.m. the following day.
Similarly if the sidereal time today is 8p.m. , tomorrow it will be four minutes less i.e. at 4 hours 56 minutes.
The sidereal time helps scientists keep a good track of time without worrying about the position of earth with respect to the sun.
learn more about sidereal time here :
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