As one of his first acts, he fired the entire force, being convinced that the morale was alarmingly low.He was the inventor of the first street lights (oil lamps) in Copenhagen, and worked hard to try to control the beggars, poor people, unemployed, and prostitutes of Copenhagen.In Copenhagen, Rømer made rules for building new houses, got the city's water supply and sewers back in order, ensured that the city's fire department got new and better equipment, and was the moving force behind the planning and making of new pavement in the streets and on the city squares.The determination of longitude is a significant practical problem in cartography and navigation.
In 1681, Rømer returned to Denmark and was appointed professor of astronomy at the University of Copenhagen, and the same year he married Anne Marie Bartholin, the daughter of Rasmus Bartholin.His mentor at the University was Rasmus Bartholin, who published his discovery of the double refraction of a light ray by Iceland spar (calcite) in 1668, while Rømer was living in his home. kontakte kostenlos Saale Rømer was given every opportunity to learn mathematics and astronomy using Tycho Brahe's astronomical observations, as Bartholin had been given the task of preparing them for publication.He was active also as an observer, both at the University Observatory at Rundetårn and in his home, using improved instruments of his own construction.Unfortunately, his observations have not survived: they were lost in the great Copenhagen Fire of 1728.
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Assume the Earth is in L, at the second quadrature with Jupiter (i.e. After several orbits of Io, at 42.5 hours per orbit, the Earth is in K.Rømer reasoned that if light is not propagated instantaneously, the additional time it takes to reach K, that he reckoned about 3½ minutes, would explain the observed delay.Oddly, Cassini seems to have abandoned this reasoning, which Rømer adopted and set about buttressing in an irrefutable manner, using a selected number of observations performed by Picard and himself between 16. Rømer presented his results to the French Academy of Sciences, and it was summarised soon after by an anonymous reporter in a short paper, , published 7 December 1676 in the Journal des sçavans.However, a former assistant (and later an astronomer in his own right), Peder Horrebow, loyally described and wrote about Rømer's observations.
In Rømer's position as royal mathematician, he introduced the first national system for weights and measures in Denmark on .
Cassini had observed the moons of Jupiter between 16, and discovered discrepancies in his measurements that, at first, he attributed to light having a finite speed.
In 1672 Rømer went to Paris and continued observing the satellites of Jupiter as Cassini's assistant.
The current observatory there was built in the 20th century to serve amateurs.
moved to Copenhagen and matriculated at the University of Copenhagen.