The Earth's Rotation is Slowing Down: The Physical Reasons and How It Affects the Number of Days in a Year

The tidal force of the Moon on the Earth can slow down the Earth's rotation, forming a "locked" or tidal synchronization phenomenon.Over the long course of the Earth's history, the Moon has gradually moved away from the Earth, and the energy of the Earth's rotation has been dissipated by the tidal forces on the surface and inside of the Earth, causing the Earth's rotation to slow down, resulting in an increase in the length of the day and a decrease in the number of days in the year.This study used Newton's law of universal gravitation and the law of conservation of angular momentum to derive a calculation formula for the rate at which the Earth's rotation slowed down, estimated the number of days in a year hundreds of millions of years ago, and verified the accuracy of the estimate using evidence from the Devonian tetracoral ridges.