Johannes Hevelius's Telescope

Johannes Hevelius's Telescope

Ertuğrul.Bülbül
Johannes Hevelius was a Protestant councilor and mayor of Gdańsk, Pomerania Province, in the Polish-Lithuanian Commonwealth. As an astronomer he gained a reputation as "the founder of lunar topography" and described ten new constellations, seven of which are still recognized by astronomers. Throughout his life, Hevelius took a leading part in municipal administration, becoming Ratsherr (town councillor) in 1651; but from 1639 on, his chief interest was astronomy. In 1641 he built an observatory on the roofs of his three connected houses, equipping it with splendid instruments, including ultimately a large Keplerian telescope of 45 m (150 ft) focal length, with a wood and wire tube he constructed himself. This may have been the longest "tubed" telescope before the advent of the tubeless aerial telescope. He discovered four comets, in 1652, 1661 (probably Ikeya-Zhang), 1672 and 1677. These discoveries led to his thesis that such bodies revolve around the Sun in parabolic paths. His observatory, instruments and books were destroyed by fire on September 26, 1679. To sum up ,you can see his telescope's re-design. #Johannes_Heveliuss_Telescope
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