Earth Rotation Is Slowing Down
Автор: The Universal Stories
Загружено: 2023-10-26
Просмотров: 94
Описание:
Earth's spin speed is slowing: every year, it takes our planet a little longer to complete one full revolution on its axis.
The change is miniscule, however. Every century, Earth slows by 1/500th of a second;
1,000 years from now, one day will be two hundredths of a second longer than today. We all know that The Moon exerts a pull on Earth, causing our planet to be slightly egg-shaped.
It affects water even more, creating tides and causing the oceans to pile up towards one side of the planet, forming a ‘tidal bulge’.
This bulge is dragged around with the Moon as it orbits. As Earth rotates faster than the Moon – 24 hours versus 27.3 days – the bulge moves slightly ahead of the Moon’s position in orbit.
The Moon pulls back on it, effectively trying to slow it down and causing Earth’s rotation rate to gradually slow down over time as a result.
As the two bodies interact through gravity, this tugging causes Earth to lose energy while the Moon gains energy.
Because of this energy boost the Moon is slowly spiralling outwards, moving away from us by 3.8cm per year.
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