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Haversine formula: d = 2r × arcsin(√(sin²(Δlat/2) + cos(lat₁)cos(lat₂)sin²(Δlon/2))). Earth's mean radius is 6,371 km. This gives the great-circle distance, which differs from driving distance due to roads. 1 nautical mile = 1 minute of arc of latitude = 1.852 km. For driving distances, use a routing API that accounts for road networks.
5.0000