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Great Circle
Distance
Calculator
Calculate great circle distance and initial bearing between two coordinates
Input Parameters
Start Latitude (degrees (N=pos))
Start Longitude (degrees (E=pos))
End Latitude (degrees (N=pos))
End Longitude (degrees (E=pos))
Calculate
Results
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Great Circle Distance
nm
--
Distance
km
--
Initial Bearing
degrees
--
Distance
statute mi
Reference
Haversine: a = sin²(Δlat/2) + cos(lat1)×cos(lat2)×sin²(Δlon/2) d = 2×R×atan2(√a, √(1-a)) R = 3440.065 nm (Earth radius) Initial bearing = atan2(sin(Δlon)×cos(lat2), ...)