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Neptune was discovered as the result of observed irregularities in the motion of Uranus and was the first planet to be discovered on the basis of theoretical calculations. J. C. Adams of Britain and U. J. Leverrier of France independently predicted the position of Neptune, and it was discovered by J. C. Galle in 1846, the day after he received Leverrier's prediction After noticing an anomaly in the orbit of Uranus, Le Verrier predicted that there may be another undiscovered planet that was pulling Uranus out of it's predicted orbit. He did the mathematical caluclations to make a prediction of where the planet should be seen. Nobody at the University of Paris (where he was studying) wanted to look for the planet, so LV asked d'arrest at the Berlin observatory. D'arrest didn't want to look either but another Berlin astronomer agreed to, his name was Galle. Galle already had a star chart from before and almost immediately found the planet about a degree away from where LV predicted it would be.

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