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He proved that the Earth is round by using the sun to measure the size of the Earth. If he didn’t measure the Earth, people might still think that the Earth is flat, and no one will know that it is round. He lived from 276–195 B.C. His measurement of the Earth 24,660 miles.
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He created a geocentric model (the earth being in the middle) of the solar system. It is important because it is one of the earliest models of the solar system so people might learn more from it. He lived from 90-168 A.D. His first observation was on March 26, 127.
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He created a heliocentric (the sun being in the middle) model of our solar system. This discovery is considered important because we believe this model of our solar system is correct. He lived from 1473–1543.
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He achieved his goal of measuring to one minute of arc. This discovery was important because it was discovered before the invention of the telescope. He lived from 1546-160.
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He proved that the planets are orbiting in ellipses and created three laws to determine the planetary motion. The importance of this discovery is that most people at that time thought the planets are orbiting in circles. He lived from 1571–1630.
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He created three laws describing the motion of forces between objects, especially gravity. The importance is that people might not know about gravity and how gravity effects on Earth or anywhere in the Universe. He lived from 1643–1727.
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He had an idea that the laws of physics are the same throughout the universe. It is important because of this discovery or assumption he thought that speed of light in a vacuum is constant, and that space and time are linked in an entity. He lived from 1879–1955.