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==Astronomy== * February 20 β [[Francesco de Vico]] discovers [[comet]] [[122P/de Vico]]. * June 1 β [[Urbain Le Verrier]] predicts the existence and location of [[Neptune]] from irregularities in the orbit of [[Uranus]]. * August 8 β Neptune observed but not recognised by [[James Challis]]. * August 31 β Urbain Le Verrier publishes full details of the predicted orbit and the mass of the new planet. * September 23 β [[Johann Galle]] [[Discovery of Neptune|discovers Neptune]]. * October 10 β [[William Lassell]] discovers [[Triton (moon)|Triton]], Neptune's largest [[natural satellite|moon]].<ref>{{cite web |title=Beer enthusiast discovers a new moon |url=https://www.telegraph.co.uk/only-in-britain/william-lassell-discovers-triton/ |website=The Telegraph |accessdate=16 February 2020 |date=10 October 2016}}</ref>
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