Yeah I've read a bunch about latitude and the definition of a nautical mile previous to his. Is the Earth that oblate to be something 7.8% or more bigger than the standard nm... that's a big difference. I figured the Earth was oblate to the tune of 0.5% to 1.0%.
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At 29º a degree of latitude is 59.846 nm. At 75º it is 60.269 nm and at 95º it is 60.305 nm. So the closer to the equator you are the shorter the definition nautical mile should be. Since we fixed that dimension, the closer to the equator you are, the shorter distance one degree of latitude is!
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56.9846.... 60.269... those numbers are a lot closer than 64.7. I can't see why 64.7 is some kind of compromise between those two.
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I'm no cartography wizard, but I thought that the map projection in the game was scrunched up at the upper latitudes and stretched out at the middle ones, and that was my guess as to why the values were off. I could be wrong.
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This seems most likely. When you're a SH4 dev and you throw the real globe out the window, you lose your appeal to reality to help you make the game. I wonder if this is why sextant navigation is so inconsistent in the game... perfectly rendered sky but with an alien earth under it?