Distance between two points on the Earth
haversine_distance(lat1, lon1, lat2, lon2)
That latitudes and longitudes of the two points.
This is reasonably accurate for distances in the order of 1 to 1000 km.
The distance in kilometres between the two points.
# Distance from YMEL to YSSY haversine_distance(-37 - 40/60, 144 + 50/60, -33 - 56/60, 151 + 10/60)
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