Earth, Moon and Sun (IMAGE)

University of Toronto

Earth, Moon and Sun

Caption

A team of astrophysicists have shown that from approximately two billion years ago until 600 million years ago, an atmospheric tide driven by the sun countered the effect of the moon, keeping Earth’s rotational rate steady and the length of day at a constant 19.5 hours.

Credit

Kevin M. Gill

Usage Restrictions

Credit must be given to the creator.

License

CC BY

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