Bras sextant, c 1658-1673.

Bras sextant, c 1658-1673.
4 0 c m
actual image size: 21cm x 32cm


Engraving from the book 'Machina Coelestis' (1673) by Johannes Hevelius (1611-1687). The image shows the German astronomer Hevelius using the bras sextant made by Gunter in 1658. Hevelius established the foremost observatory in Danzig in 1641, rebuilding it after a fire in 1679. He catalogued 1500 stars, discovered four comets and was one of the first to observe the transit of Mercury.

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© Science Museum / Science & Society Picture Library

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