Posted by robert on 05/04/06 20:34

| $distance = $r * acos(cos($lat1) * cos($lon1) * cos($lat2) * cos($lon2)
| +
| cos($lat1) * sin($lon1) * cos($lat2) * sin($lon2)
| +
| sin($lat1) * sin($lat2));
|
| where:
|
| $r -- radius of the Earth
| $lat1 -- latitude of point 1 in radians
| $lon1 -- longitude of point 1 in radians
| $lat2 -- latitude of point 2 in radians
| $lon2 -- longitude of point 2 in radians

outta curiosity, what unit of measure is this distance in?

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