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BetacommandBot17:01, 9 November 2007 (UTC)reply
Dubious
Mmccalpin, you provided a citation in support of the statement that
The ship was about 180 miles (290 km) north of Madeira.
But it is to a book, Marine Fire Prevention, Firefighting and Fire Safety at page 46, to which you obviously have access. What, exactly, does that book say the distance was? Is it like this one here, saying "180 miles (290 km)"? I doubt it.
I think this is still dubious, unless you can provide a quote from the book which either gives that distance in kilometers, else gives that distance in miles which are clearly identified, with no ambiguity. Can you do so?
And, if they are indeed
statute miles as the 290 km implies, they need to be specifically identified as such, in accordance with common sense (and for once it is something for which the guidance
Wikipedia:Manual of Style (dates and numbers) uses common sense—"Use nautical mile or statute mile rather than mile in nautical and aeronautical contexts."). If they are not, they need to be properly converted to 330 km, not 290 km, and should still be specifically identified for clarity.
Gene Nygaard (
talk)
05:02, 24 December 2008 (UTC)reply
Thanks for clarifying your original edit. I was head-faked by the fact that a location 180 miles north of Madeira is just barely north of due west of Casablanca, not northwest stated in the previous text: I considered the possibility that somehow that error was part of your meaning. Only after your above explanation did I consider statute vs nautical miles...
d'oh!
I have now edited out any mention of kilometers and have added a clarifying footnote that the available sources are unclear which mile being used. Also, I have added the URL from which I found the two citations. I had hoped to find a source with lat/long information to put the matter to rest, but alas, none have yet turned up.
It's a
routine navigational calculation (and
not Original Research!) to get the distance between two
Lat/
Long positions A and B. (The two key assumptions / approximations are tht the Earth is a sphere, and, at the equator, 1min (1°/60) is 1 nautical mile (1 n.m.). That means a complete circle of constant Longitude is 360 x 60 = 21600 n.m. .. same for the circle of Latitude at the Equator; the complication with Latitude is tht the circles get smaller as u get closer to the Poles - obviously, kind-of: the 'circle' of Latitude at 90°N is the North Pole - so
cosines get into the act.) The basis of the calculation is a triangle, on the Earth's surface, linking A and B and with a corner C on the same Lat as A, same Long as B. AC and BC are direct to calculate (applying the cos(Lat) adjustment to AC). The triangle is not completely flat; it's
possible to correct for this, by another stage of calculation, but if A, B & C are reasonably close it's (third & final approximation) flattish; and applying
Pythagoras's theorem with the figures for AC and BC gives the distance A-to-B.
Taking the stated position, and relating it to the Lat/Long for
Funchal (capital of Madeira), gives a distance of 203 stat. miles / 176 n.m. / 327km, at a bearing of 028°(T), aka NNE-ish. In the article I've revised the Note, putting some of this detail in it (and using the statute-miles / kilometres figures in the main text, as being familiar to the general readership).
2A04:B2C2:405:EB00:C54F:9BF6:E166:B4A2 (
talk)
17:21, 30 December 2023 (UTC)reply
Postwar service
The Johan van Oldenbarnevelt was refitted again in 1958 at a cost of A$800,000.
How can this be? The Australian dollar didn't exist before 1966. Was it A£400,000 (the dollar was introduced at 2 to the Australian Pound), or A£800,000 perhaps? --
Arwel Parry(talk)18:09, 19 December 2016 (UTC)reply
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