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He invented a system of longitude and latitude and made a map of the world. He made his discovery in 240 BC and its important because he made the map of our known world right now.
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Claudius made astronomical observations from Alexandria in Egypt during 127-41 AD. This is important because it was the first observation that we can date happen.
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Nicolaus discovered every planet revolves around the sun in 1508-1514. His discovery was important because he was the first European to prove the planets revolve around the sun.
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Astronomical Discover: He discovered a new star called the Cassiopeia formation in 1572. This discovery is important because it proved the star was farther away then the moon among the stars.
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Johannes discovered that planets move faster in their orbits when they are close to the sun in 1605. This is important because he discovered the orbit of Mars.
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Newton discovered the laws of gravity and he worked on multiple principles of visible light. This is important because he made principles of the laws of motion.
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Albert Einstein published his theory of relativity in 1919. His discovery was important because his theory was a true understanding of space.