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He Proposed Earth orbited the Sun contradicting the long held belief that the Sun orbited the Earth laying the groundwork for Galileo and Kepler.
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He recorded the Super Nova of 1572, where he discovered it had no diurnal parallax, proving it was beyond the Moon and plotted the motion of the comet of 1577.
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He resolved the stars in the Milky Way, discovered sunspots and measured the Sun’s rotation
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He used Brahe’s precise data to get his three laws of planetary elliptical motion
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Measured Mars and Jupiter rotation periods and was the first to get scientific records of zodiacal light and investigated atmospheric refraction.
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He discovered Omega Centauri, paid for publishing Newton’s Principia and using Newton’s gravitational law predicted the comet of 1682.
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The discoverer of Uranus and several moons of Saturn and Uranus, discovered that some double stars orbit each other and discovered infrared radiation.
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suggested the solar system evolved from a large, flattened cloud of gas and published differential equations describing planetary orbits and tides
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He discovered several comets and searched for a missing planet between Mars and Jupiter and discovered Pallas and Vesta suggesting these were fragments of the missing planet, formulated Olber’s Paradox.
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The father of modern astrometry published first accurate stellar parallax and discovered orbital deflections of Sirius and Procyon from unseen white dwarfs.