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Astronomical telescope with observer, 1647.

Astronomical telescope with observer, 1647.
4 0 c m
actual image size: 28cm x 32cm


Engraved plate taken from 'Selenographia'(1647) by Johannes Hevelius (1611-1687). Hevelius was an early German astronomer, who established the foremost observatory in Danzig in 1641, and rebuilt 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. Hevelius also determined the solar rotation period to a much better accuracy than previously achieved, and was said to have had such exceptionally keen eyesight that he could see stars of the seventh magnitude.

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