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The Impact of Tidal Forces on Earth’s Day Length

Because of the temporal balance between tidal forces from the Moon and Sun, Earth’s day lasts only 24 hours instead of the usual 60.

When the Moon formed about 4.5 billion years ago, possibly from a giant impact, it was much closer to Earth than it is now, our planet rotates much faster, and a day is less than 10 hours long. Since then, the moon has been slowly moving outward, rustling a bit. The site says that the angular momentum of the Earth, which slows down the Earth’s rotation, today, as we all know, lasts 24 hours a day on Earth. space.

However, experiments with laser reflectors left on the lunar surface by the Apollo astronauts estimated the moon’s speed away from us at about 1.49 inches (3.78 cm) per year, so our planet would have to slow down by 60 degrees.

Astronomers at the University of Toronto and Purdue University, led by Hanbo Wu in Toronto, have the answer. What is slower than deceleration? This all has to do with the balance of momentum generated by heat waves in the Earth’s atmosphere and Earth’s gravitational waves. The Moon’s gravity pulls on the Earth’s oceans, causing tides to rise on either side of the planet as the ocean follows the Moon around our planet, the end result of the Earth’s rotation slowing by about 1.7 milliseconds per century.

However, heat waves in the Earth’s atmosphere can counteract this refraction effect if their bounce period around the planet is proportional to the Earth’s rotation, and the temperature of the atmosphere controls the speed of heat waves, which become stronger as the atmosphere warms. , which leads to the creation of another type of wheel.

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