The pull of the moon tends to make days longer. For more than a billion years, the sun and our atmosphere had something to say about that
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But there’s another factor at play — the sun’s effect on the Earth’s atmosphere. Just as the sun creates tides in our oceans, it pulls on the ocean of air surrounding the planet, causing that to bulge in what’s known as an atmospheric thermal tide.Two billion years ago, the Earth was warmer than it is now, and spinning a little faster. So the day was about 19.5 hours long, and the natural resonance of the atmosphere almost exactly half that.
Of greater concern is whether humans — or indeed complex life — would have evolved at all on a planet with a longer day. Murray points to another paper, “Possible link between Earth’s rotation rate and oxygenation,” published last year by Judith Klatt in the journal Nature Geoscience.Article content
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