tag:blogger.com,1999:blog-1218157414905973664.post7167534594558445839..comments2018-05-11T12:06:47.287+02:00Comments on Barend's Blog (Boost.Geometry, Programming, Music, Languages): Spherical Side FormulaBarendhttp://www.blogger.com/profile/09980486851496193008noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-1218157414905973664.post-21031904580573922092016-01-23T12:28:09.745+01:002016-01-23T12:28:09.745+01:00Thanks Charles! Yes, in the meantime I did know th...Thanks Charles! Yes, in the meantime I did know that it was not correct, but I did not update this blogpage. I will probably remove that paragraph.Barendhttps://www.blogger.com/profile/09980486851496193008noreply@blogger.comtag:blogger.com,1999:blog-1218157414905973664.post-85516165173970102092016-01-21T21:50:59.354+01:002016-01-21T21:50:59.354+01:00Sorry, but your proof for an ellipsoid is wrong. ...Sorry, but your proof for an ellipsoid is wrong. The geodesic on an ellipsoid doesn't in general lie in a plane. A good test case is the geodesic between points p1 = 0.001N 0.01E and p2 = 0.001N 179.99E (the midpoint of this geodesic is at 88.112N 90E) with 80N 90E as your test point p.Charles Karneyhttps://www.blogger.com/profile/17933393983463933075noreply@blogger.com