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Encyclopedia Britannica - Main :: RHY-RON |
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ROEMER, OLE (Latinized OLAUS) (16441710) , Danish astronomer, was born at Aarhuus in Jutland on the 25th of September 1644. He became in 1662 the pupil and amanuensis of Erasmus Bartholinus at Copenhagen, and assisted J. Picard in 1671 to determine the geographical position of Tycho Brahe's observatory (Uraniborg on the island of Hveen). In 1672 he accompanied Picard to Paris, where he remained nine years, occupied. with observations at the new royal observatory and hydraulic works at Versailles
paper before the Academy on the successive propagation of light as revealed by a certain inequality in the motion of the first of Jupiter's satellites. A scientific mission to England in 1679 made him acquainted with Newton, Halley and Flamsteed. In 1681, on the summons of Christian V., king of Denmark, he returned to Copenhagen as royal mathematician and professor of astronomy in the university ; and from 1688 he discharged, besides, many important administrative functions, including those of mayor (1705), chief
Roemer will always be remembered as the discoverer of the finite velocity of light. He showed besides wonderful ingenuity in the improvement of astronomical apparatus. The first transit instrument worthy the name was in 1690 erected in his house
instrument with altitude and azimuth circles (for observing equal altitudes on both sides of the meridian) and an equatorial telescope. In 1704 he built, at his own cost, the so-called " Tusculan " . observatory at Vridlosemagle, a few miles west of Copenhagen, and equipped it with a meridian circle (the transit instrument and vertical circle combined) and a transit moving in the prime vertical. Roemer thus effectively realized nearly all our modern instruments
great
work
See E. Philipsen, Nordisk Universitets Tidskrift, v. r r (186o) ; P. Horrebow, Basis Astronomiae (Copenhagen, 1735) ; J. B. Delambre , Hist. de l'astr. modern, ii. 632; J. F. Montucla, Hist. des mathematiques, ii. 487, 579; R. Grant, Hist. of Phys. Astronomy, p. 461; R. Wolf, Gesch. der Astronomie, pp. 452, 489, 576; J. F. Weidler, Historia Astronomiae, p. 538; W. Doberck, Nature, xvii. 105 ; C. Huygens, tEuvres completes, t. viii. pp. 3058; L. Ambronn, Handbuch der astr. Instrumentenkunde, ii. 552, 966;T. J. J. See, Pop. Astronomy, No. 105, May 1903.End of Article: ROEMER, OLE (Latinized OLAUS) (16441710) If you wish, you can link directly to this article.
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