> The distance_to() method is a pretty standard "great circle" calculation,
> and that's exactly its purpose. Are you sure your "faster" version does
> the same? Does it yield the same (numeric) results? And besides, in the
> visual range direct_distance_to() should be good enough, and it's
> certainly
> faster. I doubt that considering Earth curvature is *that* important for
> cloud distances.

See

http://www.flightgear.org/forums/viewtopic.php?f=30&t=9495




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