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150
Ptolemy's birth
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Period: 150 to 175
Ptolemy's lifespan
Claudius Ptolemy lived in Greece. He thought of the geocentric theory. This was wrong although his theory of the planets rotating and revolving was correct. He also wrote two books called Geographia and Almagest. -
175
Ptolemy's death
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Feb 19, 1473
Copenicus's Birthday
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Period: Feb 19, 1473 to May 24, 1543
Copenicus's lifespan
Nicolaus Copernicous was the first astronomrto have the idea of the heliocentric theory. He was Polish. He thought that the planets revolved in circles. -
May 24, 1543
Coprnicus's death
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Feb 15, 1564
Galileo's Birthday
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Period: Feb 15, 1564 to
Galileo's lifespan
Galileo Galilei was an Italian Astronomer who supported the heliocentric theory. He studied Venus's phases with his invention of the telescope. He also studied Jupiter's moons to show not everything revolved around the earth. He discovered inertia. His last discovery was that the light side of the moon was just a reflection of sunlight. -
Dec 27, 1571
Kepler's birthday
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Period: Dec 27, 1571 to
Kepler's life
Johannes Kepler was a german mathmatition who supported the heliocentric theory. He studied brahe's data to find out how mars orbited. He found out that planets orbit in an ellipse or oval path. HE also discovered that the distance a planet is from the sun determans how fast it travels. -
Kepler's death
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Galileo's death
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Newtons's birthday
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Period: to
Newton's lifespan
Issac Newton was an English Astronomer who supported the heliocentric theory. He used gravity and inertia to find out how the planets stay in orbit. -
Newton's death
