flightblog/ZFHaversine — pull request #9 by bjfletcher (2013-02-05 14:48:03+00:00)
Title: Added equirectangular approximation distance formula

I have updated this to add equirectangular approximation and now this has not two but three different formulae the user can try out with. I have tested this using both short and long distances - with this equirectangular formula, the shorter the distance is, the more accurate it gets.