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php Programming Glossary: slgGreat Circle Distance question http://stackoverflow.com/questions/772878/great-circle-distance-question to GreatCircleDist . void GreatCirclePos dist course slt slg xlt xlg double dist great circle distance km double course initial.. degrees double slt starting decimal latitude S double slg starting decimal longitude W double xlt ending decimal latitude.. dist DegreesPerKm RadiansPerDegree L1 slt RadiansPerDegree slg RadiansPerDegree coL1 90.0 slt RadiansPerDegree coL2 ahav hav..
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