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Images Dated 11th September 1997

Choose from 16 pictures in our Images Dated 11th September 1997 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Artwork of refractor telescope that found Neptune Featured 11 Sep 1997 Image

Artwork of refractor telescope that found Neptune

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 Galle and D'Arrest compared the night sky to a new but unpublished star atlas, and within a few minutes found an unknown object just 1 degree from the predicted position.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