The secret of the sidereal time is hidden in the process of circumambulation of Sun by Earth. Earth rotates on its axis for 24 hours. Earth rotates 360 degrees on its axis in 24 hours revolving around the Sun. This completes one whole day called the solar day. Ideally, it is said that 24 hours is the rotation time, though this duration is 23 hours, 56 minutes and 4.09 seconds. The remaining 3 minutes 56 seconds are considered as the sidereal day, which is the remaining part of the solar day. In short, a sidereal day can be defined as the time taken to rotate from one time gap to another time gap from the middle point. The remaining time between this is called the sidereal time.
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