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One Earth day is equal to 23 hours, 56 minutes and 4.1 seconds (the time required to complete a single rotation of the Earth).
The Earth rotates in 24 hours and during that time it covers 360 degrees. One hour has 60 minutes, so a day has 24x60=1440 minutes. Therefore, the Earth covers 360/1440 degrees per day and 0.25 degrees per minute.