[PHP] Re: Maps / Distance / GeoCoding [php/mysql]

[Nathan Rixham]

Nathan Rixham wrote:
re: an earlier thread
[snip]

or you may just need this bit:

distance =
ACOS( 
SIN(Y(g.geopoint)*pi()/180)*SIN(Y(l.point)*pi()/180) 
         +COS(Y(g.geopoint)*pi()/180)*COS(Y(l.point)*pi()/180)
*COS((X(l.point)-X(g.geopoint))*pi()/180))*6372.795

used to calc the distance between two points on the surface of the earth 
accurately

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