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140
Ptolemy
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Mar 13, 1523
copernicus
publishes his heliocentric theory of the universe -
Mar 13, 1572
Tycho Brahe
disc. a supernova -
Galileo
uses telescope. discovers 4 jovian moons, the moon's craters, and the milky way galaxy -
Kepler
1st and 2nd laws of planetary motions published -
kepler
3rd law of planetary motion published -
martian polar ice caps
found by cassani -
newton
builds 1st reflecting telescope -
newton
theory of gravitation -
messier
discovers galaxies, nebula, and star clusters while looking for comets -
piazzi
discovers the 1st asteriod -
jupiter
the great red spot on jupiter becomes prominent -
hertzsprung and russel
introduce H-R program -
appollo landing