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Aug 21, 1472
New Theory of the Planets
sought to reconcile geometric descriptive models for predicting planetary motions by employing homocentric celestial spheres. -
Feb 19, 1473
Nicolas Copernicus Born
was a Renaissance astronomer, priest and the first person to formulate a comprehensive heliocentric cosmology, which displaced the Earth from the center of the universe -
Jan 1, 1514
Commentariolus
"Little Commentary",A forty-page outline of an early version of his revolutionary heliocentric theory of the universe. -
Apr 13, 1540
Narratio prima
It is an introduction to Copernicus's major work, De revolutionibus orbium coelestium.Narratio Prima is the first printed publication of Copernicus's theory -
May 24, 1543
Nicolas Copernicus Dies
He dies, held a copy of the finished work of On the Revolutions in his deathbed -
Nov 18, 1543
De revolutionibus
an alternative model of the universe to Ptolemy's geocentric system, which had been widely accepted since ancient times. -
Dec 14, 1546
Tycho Brahe born
a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations. -
Nov 18, 1551
Prutenic Tables
replaced the Alphonsine tables which had been used for 300 years. -
Feb 16, 1564
Galileo Galilei Born
was an Italian physicist, mathematician, astronomer and philosopher who played a major role in the Scientific Revolution. -
Nov 11, 1572
De nova stella
Tycho's discovery of the new star in Cassiopeia