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| import math
def coord_dist(lat1, lnt1, lat2, lnt2): sin = math.sin cos = math.cos acos = math.acos deg2rad = math.radians
R = 63713930 lat1 = deg2rad(lat1) lnt1 = deg2rad(lnt1) lat2 = deg2rad(lat2) lnt2 = deg2rad(lnt2) l = R * acos(cos(lnt1)*cos(lnt2)*cos(lat1-lat2)+sin(lnt1)*sin(lnt2)) return l
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