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Originally Posted by ichso
If I understand you correctly, then it has already been dealt with by:
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longitude (in km, per 1°) = (111.320 + 0.373sinēφ)cosφ where φ is latitude
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The determination of the latitude says something about the angle in which the map should be "round" at a certain latitude value. The curvature of the world at this latitude.
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The map is OK, it's a proper projection on flat screen. If you connect some points, they are exactly on a given meridian as they should, but the whole map should be about 50% width! The explanation why is in post #15 and the above formula.