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Period: 276 BCE to 194 BCE
Eratosthenes
He made the first accurate messurement of the circumference of the Earth. It was able to help us grasp a better understanding of our solar system -
140
Claudius Ptolemy
He beleived the Earth was the center of the universe. This is important becausee it allowed people to question what he thought and figure out it wasnt true. -
1543
Nicolaus Copernicus
He came up with the theory that the Sun is at the center of the Universe, and the Earth spins on its axis once daily and goes around the sun annually. This is called the heliocentric, or Sun-centered, system -
1570
Tycho Brahe
He came up with the Tychonic System which stated the sun, moon, and stars circle Earth, while the five planets orbit the sun -
Period: to
Johannes Kepler
the three laws stated (1) All planets move around the Sun in elliptical orbits, having the Sun as one of the foci. (2) A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time. (3) The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun. This helped us fully understand how our solar system worked -
Period: to
Sir Isaac Newton
He was the one that discovered gravity and figured out that the force of gravity was what kept the planets in their orbit -
Albert Einstein
Best known for his Special and General Theory of Relativity and the concept of mass-energy equivalence expressed by the famous equation, E = mc2.