planetary motion

Danish astronomer whose observations of the planets provided the basis for Kepler's laws of planetary motion (1546-1601)

English scientist who formulated the law of elasticity and proposed a wave theory of light and formulated a theory of planetary motion and proposed the inverse square law of gravitational attraction and discovered the cellular structure of cork and introduced the term `cell' into biology and invented a balance spring for watches (1635-1703)

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