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Ptolemy was an astronomer and mathematician. He believed that the Earth was the centre of the Universe. The word for Earth in Greek is geo, so we call this idea a "geocentric" theory.
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Nicolaus Copernicus formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe.
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His discovery of the four most massive moons of Jupiter, now known as the Galilean moons.
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He was the second Astronomer Royal in Britain, succeeding John Flamsteed in 1720. From an observatory, he constructed on Saint Helena. Halley recorded a transit of Mercury across the Sun.
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Johannes Kepler discover Kepler's three laws of planetary motion.
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William Herschel discovered Uranus.
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Piazzi named it after Ceres, the Roman goddess of agriculture.
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Discovered Pluto
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