9-23-1846

Neptune discovered. Johann Galle and Heinrich Louis d'Arrest discovered Neptune based on Urbain Le Verrier's (1811-1877) calculations. Amazingly, they found it the first night they looked. John Couch Adams (1810-1892) independently calculated the orbit. This marvelous feat based on a mathematical prediction really excited the scientific community.

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Neptune and Pluto Discovery
Urbain Le Verrier