Strange Posted January 5, 2019 Share Posted January 5, 2019 Interesting article on the longest straight line land route (from Portugal to China) and sailable sea route. https://bigthink.com/strange-maps/these-are-the-worlds-longest-straight-lines Link to comment Share on other sites More sharing options...
studiot Posted January 5, 2019 Share Posted January 5, 2019 Thank you Strange, but the article lost me completely in journalistic hype. What do they mean by a straight line? If they mean the royal road definition, then the line from A to B is different from the line from B to A, as every geodetic surveyor should know. Link to comment Share on other sites More sharing options...
John Cuthber Posted January 5, 2019 Share Posted January 5, 2019 Is this article sponsored by the flat Earth society? 1 Link to comment Share on other sites More sharing options...
Strange Posted January 5, 2019 Author Share Posted January 5, 2019 8 minutes ago, studiot said: What do they mean by a straight line? A great circle. (Obviously?) The paper is here, if you want more details: https://arxiv.org/abs/1804.07389 11 minutes ago, studiot said: If they mean the royal road definition What is that? It is not a term I have heard before (apart from once living on El Camino Real). Link to comment Share on other sites More sharing options...
studiot Posted January 5, 2019 Share Posted January 5, 2019 (edited) 59 minutes ago, Strange said: A great circle. (Obviously?) The paper is here, if you want more details: https://arxiv.org/abs/1804.07389 What is that? It is not a term I have heard before (apart from once living on El Camino Real). Why a great circle? There are no great circles on this Earth. It has to do with skew normals on the real Earth, which anyone going to all that compute trouble to calculate should be using. Here is the short version, in particular fi94 and the paragraph immediately above it which describes what happens if one starts at A and tries to peg out the line to B, using a theodolite and then travels to B and views that line of pegs using the theodolite. Here is the long version http://www2.unb.ca/gge/Pubs/LN39.pdf See also p88 of the long version for the steve upson's missing link in his one sided thread. Edited January 5, 2019 by studiot Link to comment Share on other sites More sharing options...
Strange Posted January 5, 2019 Author Share Posted January 5, 2019 11 minutes ago, studiot said: has to do with skew normals on the real Earth, which anyone going to all that compute trouble to calculate should be using. You’ll have to read the paper to see if they meet your exacting standards or just used a realistic approximation. Link to comment Share on other sites More sharing options...
studiot Posted January 5, 2019 Share Posted January 5, 2019 If it's only an approximationhow can the show that they have found the longest line? See also my edit above. Link to comment Share on other sites More sharing options...
Strange Posted January 5, 2019 Author Share Posted January 5, 2019 Get a life, man. Sheesh. It’s a bit of fun. Link to comment Share on other sites More sharing options...
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