## Fix Python – Getting distance between two points based on latitude/longitude

I tried implementing this formula: http://andrew.hedges.name/experiments/haversine/

The aplet does good for the two points I am testing:

Yet my code is not working.

from math import sin, cos, sqrt, atan2

R = 6373.0

lat1 = 52.2296756

lon1 = 21.0122287

lat2 = 52.406374

lon2 = 16.9251681

dlon = lon2 – lon1

dlat = lat2 – lat1

a = (sin(dlat/2))**2 ….