# Haversine Distance -  - $d = 2r\times arcsin(\sqrt{sin^{2}(\frac{\varphi_{2}-\varphi_{1}}{2})+cos(\varphi_{1})cos(\varphi_{2})sin^{2}(\frac{\lambda_{2}-\lambda_{1}}{2}))}$ - Haversine distance is the distance between two points on a sphere given their longitudes and latitudes - The main difference is that no straight line is possible since the assumption here is that the two points are on a sphere. - ssumed the points lie on a sphere - As you might have expected, Haversine distance is often used in navigation - calculate the distance between two countries when flying between them - Note that it is much less suited if the distances by themselves are already not that large. The curvature will not have that large of an impact.