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php Programming Glossary: dloGreat Circle Distance question http://stackoverflow.com/questions/772878/great-circle-distance-question S double xlg ending decimal longitude W double c d dLo L1 L2 coL1 coL2 l if dist KmPerDegree 180.0 course 180.0 if.. hav c sec L1 csc d hav d coL1 L2 HalfPI coL2 l L2 L1 if dLo cos L1 cos L2 0.0 dLo ahav hav d hav l dLo if c 0.0 dLo dLo.. hav d coL1 L2 HalfPI coL2 l L2 L1 if dLo cos L1 cos L2 0.0 dLo ahav hav d hav l dLo if c 0.0 dLo dLo slg dLo if slg PI slg..
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