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I hate to admit but this young lady is ten times the sailor Zacis
Ronald Raygun wrote:
Yes I know about all that, but it fails to address my specific point that the "triangle" formed by the departure and destination points and a third point chosen in such a way that the latitude and longitude differences make up the two sides (the third side being the great circle route) is not actually a proper spherical triangle (and the spherical cosine rule therefore does not apply), because the longitude difference "side" is not a great circle. Sorry, I misread your original post and didn't notice what triangle you had in mind. I've used one of them (or both) to compute the direction to point a directional antenna to in my youth, so it's not too hard. Easier in your youth than now, I expect! :-) Just not any longer in memory, but nothing fancy. What I still didn't do is to derive the sine and cosine rule from a series of rotations, which would be a way for me to really remember the stuff. But I didn't do that in my youth, either. Regards, -is -- seal your e-mail: http://www.gnupg.org/ |
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