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Distance = Radius of Earth*Pi*cos-1(cos(Latitude Point 1)*cos(Latitude Point 2)*cos((Longitude Point 2)-(Longitude Point 1))+sin(Latitude Point 1)*sin(Latitude Point 2))/180 Use decimal latitude and longitude. cos-1 is supposed to indicate inverse cosine, Radius of Earth about 3960 miles or 6373 km according to Wikipedia. Multiplying by Pi and dividing by 180 converts the interim result in degrees into a result in radians.
Tina Cordon23:58, 17 April 2007 (UTC)reply
Thank you. I used to enjoy maths, a long time ago. Now I can't remember why..! Disappointingly, none of the external links on the above page is to a site which lets users enter two sets of coordinates, then returns the distance beteeen them. Do you know of such a site, or a freeware Windows utility, which does that (I'll ask there, too)?
Andy Mabbett11:42, 18 April 2007 (UTC)reply
A Concensus reached with respect to an issue discussed on the Tinsley Viaduct article cannot be taken to apply to all pages on Wikipedia. If there is an objection to the inclusion of information on the Netherton Tunnel Branch Canal page discuss it here. Netherton Tunnel Branch Canal is significantly longer, bigger and more substantial than Tinsley Viaduct. Like is not being compared with like.
Tina Cordon14:54, 17 April 2007 (UTC)reply
There is an old building near the South Portal of Netherton Tunnel which looks like an old engine house. Does anyone know what it is? It may be worth including this information in this article.
Tina Cordon00:03, 18 April 2007 (UTC)reply