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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.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.Unfortunately the paper bears the stamp of the reporter failing to understand Rømer's presentation, and as the reporter resorted to cryptic phrasings to hide his lack of understanding, he obfuscated Rømer's reasoning in the process.
The determination of longitude is a significant practical problem in cartography and navigation.
In scientific literature alternative spellings such as "Roemer", "Römer", or "Romer" are common.
Rundetårn, or round tower, in Copenhagen, on top of which the university had its observatory from the mid 17th century until the mid 19th century, when it was moved to new premises.
However, with refinements the method could be made to work on land.
After studies in Copenhagen, Rømer joined the observatory of Uraniborg on the island of Hven, near Copenhagen, in 1671.