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Category Archives: astronomy
The Length of a Day
The Earth spins with axis and rate of rotation which can change only due either to precession as a result of being in a gravitational gradient (which causes the axis to wobble slightly with a period of about 26000 years), … Continue reading
Posted in astronomy, mathematics, physics
Comments Off on The Length of a Day
Sunrise and Sunset at Solstices
It is curious that the days of shortest and longest periods of sunlight (which just about everyone knows are due to the tilt of the earth’s spin axis relative to the plane of its orbit) are not everywhere the same … Continue reading