What are the causes of tides on the earth?

Ocean tides are produced by the gravity of the moon, the sun and other celestial bodies. Under the action of gravity, the moon is attractive to the sea water on the earth. People call the force that attracts the high tide of seawater tidal force, which is different from the distance between the earth's surface and the moon. Therefore, the tidal force imposed by seawater varies from place to place. Generally, the seawater facing the moon exerts a larger tidal force, while the seawater facing the moon exerts a smaller tidal force and a larger centrifugal force. Under the action of centrifugal force, the sea runs with its back to the moon, so there will also be long tides. Due to the movement of celestial bodies, the tidal force exerted by seawater everywhere is constantly changing, which makes the seawater on the earth rise and fall, thus forming a tidal phenomenon.

The tide is very punctual. They are almost as accurate as clocks. The moon orbits the earth for 24 hours and 48 minutes, and the cycle of tides is also 24 hours and 48 minutes. During the day and at night, most of the sea water looks like the moon once, with its back to the moon once, and the sea water naturally fluctuates twice.