Sept. 23, 1846: Johann Galle discovers Neptune

For decades following the discovery of Uranus in 1781, astronomers were puzzled by the irregularities in the planet’s orbit. Newton’s laws could not explain the perturbations, suggesting another planet was out there, affecting Uranus’ path.…

Summary from Astronomy Magazine.

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   Sept. 23, 1846: Johann Galle discovers Neptune ↗