-
140
Ptolemy
140 - Greek astronomer Ptolemy develops geocentric theory of the universe
with Earth at the center -
Oct 24, 1543
Copernicus
1543 - Polish astronomer Nicolaus Copernicus publishes his heliocentric theory
of the Universe -
Oct 24, 1572
Tycho Brahe
1572 - Danish astronomer Tycho Brahe discovers a supernova in constellation of
Cassiopeia -
Galileo
1609 - Italian astronomer Galileo Galilei uses telescope to discover four moons of
Jupiter, craters of the moon and the Milky Way Galaxy -
Galileo
1610 - Galileo Galilei discovers Saturn’s rings