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interesting degrees calc. of same compiler

adr179

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It has nothing to do with ADE as such, but it's involved in this story, so I'm posting here.

Made an airport in ADE, runway is 1202 by 30 meters, heading in ADE is 151.22 degrees. Next I made a four-sided poly(it won't be ground poly) with same dimensions and exported it as FSX model, placed it in the scenery with the same coordinates and heading as data for runway in ADE. It sure does overlap with ADE runway, but, surprise, surprise, if I want the long edges of the poly to be parallel to the ADE runway, I need do give poly a heading of 151.19, that is 0.03 degrees difference? Mag. var. for location is -1.9, so this has nothing to do with the issue. No big deal, just curious if somebody in the audience has any idea why it's happening.
 
Could be. But the Earth is curved for both elements, I guess. And both were compiled with same compiler - SDK's bglcomp.exe.
 
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