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Task/Haversine-formula/Nim/haversine-formula.nim

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+import math
+
+proc radians(x): float = x * Pi / 180
+
+proc haversine(lat1, lon1, lat2, lon2): float =
+  const r = 6372.8 # Earth radius in kilometers
+  let
+    dLat = radians(lat2 - lat1)
+    dLon = radians(lon2 - lon1)
+    lat1 = radians(lat1)
+    lat2 = radians(lat2)
+
+    a = sin(dLat/2)*sin(dLat/2) + cos(lat1)*cos(lat2)*sin(dLon/2)*sin(dLon/2)
+    c = 2*arcsin(sqrt(a))
+
+  result = r * c
+
+echo haversine(36.12, -86.67, 33.94, -118.40)