Definitions

1. noun

A person who studies the motion of celestial bodies, especially the planets, especially Johannes Kepler (1571-1630), a German mathematician and astronomer who discovered the laws of planetary motion.

“The astronomer’s work was heavily influenced by the findings of Kepler about the orbits of planets.”

2. proper noun

Johannes Kepler, a German mathematician and astronomer who discovered the laws of planetary motion.

“Kepler’s laws of planetary motion are still widely used in astronomy today.”

3. adjective

relating to or denoting Johannes Kepler or his work

“The Kepler telescope is a modern telescope that uses the principles discovered by Kepler to study the orbits of planets.”