The Milky Way rotates about its center once every 200 million years, so in the 4.6-billion-year history of the Earth, we have completed 23 rotations.

Name: The Milky Way rotates about its center once every 200 million years, so in the 4.6-billion-year history of the Earth, we have completed 23 rotations.
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The Earth is approximately 4.6 billion years old, and if the Milky Way rotates once every 200 million years, dividing 4.6 billion by 200 million gives approximately 23 rotations.

The Milky Way Rotates About Its Center Once Every 200