There is a 4-minute difference between the solar day and the sidereal day because: The Earth must revolve an additional degree in order to put the Sun into alignment with the same perceived meridian in the sky after one complete axial rotation. Because of this, the solar day is approximately 4 minutes longer than the sidereal day.
A solar day refers to a day's length which is measured to be twenty-four hours.
A sidereal day represents the amount of time it takes for the earth to complete a rotation on its axis in relation to the starts.
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