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Sep 30, 1543
Nicolaus Copernicus discovers that the planets rotate
Copernicus publishes "De Revolutionibus". De Revolutionibus, Copernicus's description of his heliocentric model of the solar system, was published two months before his death. p. 46-47, F 1.25, F 1.26, A1.26 -
Period: Sep 30, 1543 to
THE SCIENTIFIC REVOLUTION
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Sep 30, 1572
Tycho observes supernova
Tycho observes supernova. Tycho's book about his observations of the supernova established his reputation as an astronomer. p. 48-49 -
Bishop Ussher finds age of the earth
Bishop Ussher uses Bible to calculate age of Earth. From the chronology of Biblical events, Ussher concluded that the Earth was created in 4004 BC. -
Edumnd Halley discovers stars
Edmund Halley discovers stars move through space. Halley found that the positions of stars change with time. He explained the changes in position as due to the individual motions of stars through space. -
Pierre Laplace proposes stars can produce black holes
Pierre Simon Laplace proposes stars can produce black holes. Laplace proposed that if a star is so compact that its escape velocity exceeds the speed of light, then not even light can escape from the star.