Tides are caused by the gravitational forces exerted by the moon and the sun on the Earth. The gravitational pull of these celestial bodies causes the water on Earth to bulge out in the direction of the gravitational pull. This results in high tide. As the Earth rotates, different parts of the Earth experience high tide at different times.

The Earth's rotation and the positions of the moon and the sun are predictable. Scientists can use this knowledge to calculate the timing and height of tides in advance. They consider factors such as the moon's phase, the distance between the Earth and the moon, the Earth's latitude, and the shape of the coastline. By using mathematical models, scientists can predict tides with a high degree of accuracy.

Tidal predictions are important for various activities such as navigation, fishing, and coastal engineering. They help to ensure the safety of ships and people engaged in marine activities. Tide tables, which provide tidal predictions for specific locations, are published regularly and can be accessed by anyone interested in knowing the timing of tides.