Talk:Ole Rømer

message: In Denmark his name is written "Ole Rømer".  Seindal, Wednesday, April 3, 2002
My book explicitly says that he never calculated the speed of light and that the orbit of Earth and Jupiter was not known in his time. The article said differently. Lir 02:23 Nov 19, 2002 (UTC)
:Hello. You would need to state the title of "your" book. 86.52.114.223 (talk) 16:16, 20 January 2014 (UTC)
thread_title: Untitled

message: "Notable is also his definition of the new Danish mile. It was 24,000 Danish feet, which corresponds to 4 minutes of arc latitude, thus making navigation easier."
This is a conflation of the definitions of two different units of measure, the Danish land mile of 24,000 feet, and the geographical mile of four minutes of arc.
I'm pretty sure it hasn't always been mixed up this way in the article, so the first thing I'll do is check the history.  Gene Nygaard (talk) 01:19, 3 March 2008 (UTC)
replies: text: My recollections were faulty, and this has been incorrect since User:Egil added it over 3 years 1 month ago in this edit.  So there isn't any better version to revert to, it just needs fixing.  Gene Nygaard (talk) 01:25, 3 March 2008 (UTC)
replies: text: I agree that this looks wrong and I've removed the mention of the "four minutes of arc"-mile. Rømer defined the Danish mile as 24,000 Danish feet which corresponded to about 7,532m, while the geographical mile of four minutes of arc is about 7,422m, so there are clearly two different miles here. For all I know, Rømer may have chosen the value of 24,000 to correspond roughly with 4 seconds of arc, but I can't find a source supporting that idea, so unless someone else can, this certainly does look like someone conflated the two miles by mistake. Hemmingsen 19:22, 25 October 2008 (UTC)
thread_title: Dubious

message: The article mentions that "Rømer joined the observatory of Uraniborg on the island of Hven, near Copenhagen, in 1671"; however, the article on Uraniborg mentions that "The institution was destroyed in 1601 after Tycho's death" and later "both Uraniborg and Stjerneborg were destroyed shortly after Tycho's death," without any mention of the observatory being rebuilt at any point until recently ("Uraniborg's grounds are currently being restored," which doesn't specify the date, but obviously in the 20th or 21st century).
Does anyone have any explanation for this apparent anachronism?
Thanks in advance.
CielProfond (talk) 03:10, 19 February 2017 (UTC)
thread_title:  Anachronism? 

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