Length of a Day

Length of a Day

400 million years ago there were 22 hours in a day and more than 400 days in a year and 900 million years ago, there were 18 hours in a day. Also every 13,000 years or so, it's winter in July in the northern hemisphere (and vice versa for the southern) due to earth axial wobble.

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Categories: ScienceWorld

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