----------------------------Original message----------------------------
THe opposite side of the world:
 
Take a known Lat-Long.
 
Latitude is the same, but North becomes South & vice-versa.
Subtract your current longitude from 180, and swap east for west, or
vice versa.
 
This should do it...
 
Thus Philly's antipodes is:
40*S, 104*47'E, in the Indian ocean SW of Australia.
 
--
Nat Case
Hedberg Maps, Inc.
 
Publisher of PROFESSOR PATHFINDER Maps
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