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Neptune
Neptune

... In the 1840s, astronomers were interested in the planet Uranus, the most recently discovered planet. Since it was so far away, one of the best ways they had to learn more details about Uranus was through math. Mathematicians were studying Uranus's orbit when they noticed something strange. Uranus di ...
Neptune
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... Uranus, the most recently discovered planet. Since it was so far away, one of the best ways they had to learn more details about Uranus was through math. Mathematicians were studying Uranus's orbit when they noticed something strange. Uranus didn't travel along its path at an even speed. It sped up ...
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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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