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85
Claudius Ptolemy Born
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Period: 85 to 165
Ptolemy's Theory Says Earth is the Center of the Universe
This is known as the geocentric view. He based his analysis on his own observations of the universe. -
165
Ptolemy Dies
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Period: 1491 to 1503
Copernicus Studies at Universities
He begins to question what he is being taught about the geocentric model of the universe. -
Feb 19, 1493
Nicolaus Copernicus Born
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1514
Copernicus Circulates Little Commentary
It introduces the heliiocentric model, where the sun is the center of the solar system. -
May 24, 1543
Copernicus Dies
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Feb 15, 1564
Galileo Born
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Galileo Finds Support for the Heliocentric Theory
He realizes that tide patterns could be explained by the heliocentric theory but not the geocentric theory. -
Dialogue Concerning the Two Chief World Systems Is Published
This compares Ptolemaic conceptions and Copernican conceptions of the universe. -
Galileo Dies
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Isaac Newton Born
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Newton Attends King's School at Grantham
He shows his passion for science by making contraptions rather than socializing. -
Newton Publishes Mathematical Principles of Natural Philosophy
It covers the three laws of motion. -
Newton Dies
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Dmitri Mendeleev Born
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Mendeleev Publishes Organic Chemistry
He noticed that people were unable to grasp the concepts of chemistry becuase there was no agreed-upon way to describe and discuss the different elements. -
Marie Curie Born
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Mendeleev Devises the Periodic Table
The Periodic Table of Elements became a common lexicon for elements that could predict and contain future discoveries of elements. -
Curie Announces Discovery of Radium and Polonium
Marie Cutie found materials with properties that didn’t match up with their compositions, and she found out they were made of undiscovered elements. -
Marie and Pierre Curie Isolate Radium
This led to better understanding of atomic structure and radioactivity. -
Mendeleev Dies
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Curie Provides mobile X-ray service for wounded soldiers in World War I
Curie’s research allowed for medical advancements. -
Curie Dies