Johannes Kepler
					(1571 - 1630)
		"Kepler worked out his three laws of planetary orbits - now known as Kepler's laws of motion - using data obtained by Tycho Brahe, whom he had assisited for the last few months of the Danish astronomer's life. Kepler was convinced that Brahe's observations were accurate, and persisted until he had calculated the orbits correctly. By 1609, Kepler had found that the orbits of planets were ellipses, not circles, and that the speed of a planet around its orbit was slower the farther away it was from the Sun. Kepler was a Lutheran and, because of religious perscution, had to move several times. In 1627 he published the Rudolphine Tables, which allowed astronomers to calculate the ppositions of planets, in the future, present, and past. Mistakenly, he suggested that planets emitted musical notes as they moved." This passage was taken from the Dorling Kindersley Space Encyclopedia by Heather Couper and Nigel Henbest.