Definition

Proper noun A German astronomer, mathematician, and astrologer of the 17th century. He is a seminal figure in the Scientific Revolution, best known for formulating the three laws of planetary motion, which describe the orbits of planets around the Sun. His work provided a crucial foundation for Isaac Newton's theory of universal gravitation.

Usage Examples

• As a subject: published his first two laws of planetary motion in 1609.
• In possessive form: third law relates the orbital period of a planet to its distance from the Sun.
• As an object of study: The biography details the life and struggles of .

Advanced Usage

• Keplerian (adj): Pertaining to or characteristic of Kepler or his laws of planetary motion.
  • The spacecraft entered a stable Keplerian orbit around Mars.
• In compound terms (used attributively): The was a NASA observatory named in his honor, designed to discover Earth-size planets orbiting other stars.

Variants and Related Words

• Kepler (n): The more common shortened form of the name Johan Kepler.
• Johannes Kepler (n): The full Latinized form of his name, which is also widely used.

Synonyms

• The astronomer Kepler: Used to specify his primary historical role.
• The founder of celestial mechanics: A descriptive title highlighting his contribution to the field.

Related Phrases and Idioms

• Kepler's Laws (noun phrase): This is the primary idiomatic phrase directly associated with his name, always referring to his three fundamental laws of planetary motion.
  • Understanding Kepler's Laws is essential for studying orbital mechanics.

Noun

1. German astronomer who first stated laws of planetary motion (1571-1630)