• Andy McIntyre posted an update in the group Group logo of Fact a Day 2022Fact a Day 2022 1 month, 2 weeks ago

    2/2 The length of Earth’s day is increasing. When Earth was formed 4.6 billion years ago, its day would have been roughly six hours long. By 620 million years ago, this had increased to 21.9 hours. Today, the average day is 24 hours long, but is increasing by about 1.7 milliseconds every century. The reason? The moon is slowing down Earth’s rotation through the tides that it helps create. Earth’s spin causes the position of its tidal ocean bulges to be pulled slightly ahead of the moon-Earth axis, which creates a twisting force that slows down Earth’s rotation. As a result, our day is getting longer — but not long enough to make a difference to your busy schedule.

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