Johannes Kepler
by Science Photo Library
Title
Johannes Kepler
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Johannes Kepler. Portrait of Johannes Kepler (1571-1630), the German astronomer who devised the three fundamental laws of planetary motion. These laws were based on detailed observations of the planets made by Tycho Brahe and himself. Kepler's first law states that the planets orbit the Sun in elliptical paths, with the Sun at one focus of the ellipse. The second law states that the closer a planet comes to the Sun, the more rapidly it moves. Kepler's third law states that the ratio of the cube of a planet's mean distance from the Sun to the square of its orbital period is a constant. Isaac Newton used Kepler's Laws and observations to formulate his theory of gravity.
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February 16th, 2021
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