Refractor telescope that found Neptune

Refractor telescope that found Neptune

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Credit: JULIAN BAUM/SCIENCE PHOTO LIBRARY

Caption: Refracting telescope. Artwork of the 23 centimetre (9-inch) Fraunhofer refractor telescope at Berlin Observatory, Germany, on 23 September 1846, the night that it was used to discover Neptune. German astronomer Johann Galle, aided by Louis D'Arrest, looked in a portion of the sky where the French astronomer Leverrier calculated a planet would be. This calculation was based on perturba- tions in the orbit of Uranus. Galle and D'Arrest compared the night sky to a new but unpublished star atlas, and within a few minutes found an unknown object just 1 degree from the predicted position. Observations the following night showed that it had moved, proving that it was a planet.

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Keywords: art, artwork, astronomical, astronomy, berlin observatory, d'arrest's telescope, discovery, equipment, fraunhofer refractor telescope, galle, historical, history of, instrument, johann's telescope, leverrier's confirmation, neptune, neptune discovery, refractor telescope, telescope, telescopes

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