Sept. 23, 1846: Neptune Right Where They Said It Would Be

1846: German astronomer Johann Gottfried Galle, knowing exactly where to look, confirms the existence of an eighth planet in the solar system, Neptune.
Galle was not the first astronomer to see Neptune — Galileo, puzzled by the changing position of what he thought was a fixed star, had sketched the movement in 1613 but never published [...]

Source: http://www.wired.com/thisdayintech/2011/09/0923neptune-discovered-where-predicted/

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