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Period: 195 BCE to 276 BCE
Eratosthenes
He was an Astronomer, mathematician, and Geographer. He used the sun to measure the size of the round Earth. This was because people thought that the world was actually flat. His measurements were only 211 miles off of the true measurement. -
Period: 100 BCE to 170 BCE
Claudius Ptolemy
Created the Geocentric theory, Ptolemaic system, which stated that the Earth was at the center of our solar system. It also said that the planets moved in an epicycle and Earth moves along an equant. -
Period: 1507 to 1515
Nicolaus Copernicus
He created the Heliocentric system, which stated that the sun was actually the center of the solar system. Nicolaus brought this information to the world of the renaissance. He also said that Earth rotated on its axis. This system was different from everything else. -
Period: 1546 to
Tycho Brahe
He was a Danish Astronomer. He kept detailed measurements of the planet's path. He was also the teacher of Kepler. Tycho also observed a supernova. -
Period: 1571 to
Johannes Kepler
He determined that the planets traveled around the sun in ellipses not circles. He calculated three laws that are still used today. -
Period: to
Sir Isaac Newton
Discovered the forces of gravity. Created three laws of motion of forces between objects. -
Period: to
Albert Einstein
Albert Einstein was a German physicist. He discovered that the laws of physics are the same throughout the universe. He also learned that the speed of light in a vacuum is constant and space and time are linked which makes it distorted by gravity.