What are Kepler's three laws?

Kepler's first law: all planets orbit the sun in ellipses, and the sun is at a focus of all ellipses.

Kepler's second law: also known as the law of area, at the same time, the connection between the sun and the moving planet sweeps the same area.

Kepler's Third Law: The ratio of the third power of the semi-major axis of all planetary orbits to the second power of period of revolution is equal.

Extended data:

Kepler's law applies to all celestial bodies around the center in the universe. Kepler's second law, whether in geometric language or in equations, relates the coordinates and time of planets to orbital parameters. Effectively solved the interpretation of the law of celestial motion.

In the study of celestial motion, the effective combination of Newton's mechanics and Kepler's three laws can be used to predict the orbit, velocity and rotation period of celestial bodies, thus predicting the position of celestial bodies in space at a certain moment, which can be applied to celestial exploration, satellite launch and other fields.