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276 BCE
Eratosthenes was born
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240 BCE
Eratosthenes measured the circumference of the earth
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194 BCE
Eratosthenes Died
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85
Claudius Ptolemy
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130
Ptolemy was convinced that the Earth was the center of the Universe. He made calculations on the rotations and was accepted as one of the greatest astrologists.
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165
Claudius Ptolemy
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1473
Copernicus
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1512
Copernicus releases his ideas on the Earth revolving around the Sun to his close friends.
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1543
Copernicus publishes his book
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1543
Copernicus
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Feb 15, 1564
Galileo Galilei was born
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Galileo believed the heliocentric view
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Galileo discovered that Copernicus was right
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Galileo's astronomical observation had a visible supernova
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Galileo saw Jupiter's moons orbit which contradicted the idea that Earth was the center of the universe
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Galileo Galilei died
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Isaac Newton was born
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Newton had a theory about gravity when he questions an apple falling
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Discovered the laws of motion and gravity
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Newton discovered white light is made of all colors (published 1762)
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Isaac Newton died
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Charles Darwin was born
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Marie Curie was born
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Alfred Wegener was born
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Charles Darwin died
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Polonium Discovery
Marie Curie discovered Polonium, which is 400 times more radioactive than any other known element at the time. -
Radium Discovery
Marie discovers radium, which is 900 times more radioactive than polonium. -
Rays of Polonium and Radium
Marie discovered the rays of polonium and radium were tiny atoms that were disintegrated inside the elements. -
Haary Hammond Hess was born
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Wegener co wrote The Thermodynamics of the Atmosphere
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Alfred Wegener dies
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Marie Curie dies
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Harry Hess discovered the ocean floor wasn't smooth
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Harry Hammond Hess dies