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141
Claudius Ptolemy
Dates: 141 A.D. Discovered: Ptolemy predicted the motion of the planets & wrote a book explaning the motions of the planets and stars. References:http://www.kidsnewsroom.org/elmer/infocentral/space/html/exploration/people/ptolemy.html -
Oct 1, 1473
Nicolaus Copernicus
Dates: 1473-1543 Discovered: Copernicus was a mathematician & an astronomer who proposed that the sun was stationary in the center of the solar system & the earth revolved around it. References:http://pato.stanford.edu/entries/copernicus/ -
Oct 1, 1546
Tycho Brahe
Dates: 1546-1601 Discovered: Brahe made careful observations of a comet in 1577. He also made observations of a supernova in 1572. References:http://csep10.phys.utk.edu/astr161/lect/history/brahe.html -
Oct 1, 1564
Galileo Galilei
Dates: Born February 15, 1564 & January 1610 Discovered: Galileo discovered moons around other planets then earth & described far beyond the planets 36 stars in the plejads. Also 40 stars in the praesepe cluster References:http://www.kidsnewsroom.org/elmer/infoCentral/frameset/inventors/galileo/index.html -
Oct 1, 1571
Johannes Kepler
Dates: December 27, 1571-November 15, 1630 Discovered: Kepler discovered the 3 laws of planetary motion & the first to explain it. He was founder of "celestial mechanics." References:http://http://en.wikipedia.org/wiki/Johannes_Kepler
http://www.johanneskepler.com/ -
Isaac Newton
Dates: 1642-1727 Discovered: Newton was the first to formulate & test the law of universal gravitation. References:http://scienceworld.wolfram.com/biography/Newton.html -
Edwin Hubble
Date: November 20, 1889-September 28, 1953 Discovered: Edwin was the first man able to show that the universe was expanding. References: http://en.wikipedia.org/wiki/Edwin_Hubble http://www.edwinhubble.com/
