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Eratosthenes compared the position of the Sun’s rays in two locations to calculate the spherical size of the Earth with reasonable accuracy
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**created the geocentric view
*Geocentric=earth was center of the universe -
*discovered the heliocentric theory
*heliocentric model -
worked with kepler and copernicus to prove mathematically that planets move in elliptical orbits rather than circles
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Empiricism: Basing your knowledge on what you can prove- experiments
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*believed the sun was the center of the universe=Heliocentric model
*used a telescope of his own invention -
prove mathematically that planets move in elliptical orbits rather than circles
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used geometry and algebra
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thought we were born knowing nothing.
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*developed the 3 basics laws of motions and the law of gravitational motion
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*BUILDING THE PERIODICTABLE OF ELEMENTS
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*discovered radium and polonium
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*discovers Cepheid variable stars
*established the period-luminosity relationship, astronomers could determine cosmic distances -
produced evidence that the continents are in motion, but because he could not explain what forces could move them
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*found evidence for an expanding universe
* ^ "redshift" -
confirmed Wegener’s ideas by using the evidence of seafloor spreading to explain what moved the continents.