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How old is Earth's period of revolution?

Updated: 8/17/2019
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12y ago

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Using the definition of revolution around the sun - then as old as the Earth, or about 4.5 billion years. It is essentially unchanged since then.

It's rotation around its axis (a day) started later (maybe a quarter of a billion years later) but is constantly slowing down.

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Q: How old is Earth's period of revolution?
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