Question: how to calculate distance between two latitude and longitude manually?
Answer: from math import cos, asin, sqrt, pi def distance(lat1, lon1, lat2, lon2): p = pi/180 a = 0.5 - cos((lat2-lat1)*p)/2 + cos(lat1*p) * cos(lat2*p) * (1-cos((lon2-lon1)*p))/2 return 12742 * asin(sqrt(a)) #2*R*asin... And for the sake of completeness: Haversine on wiki.