Simple node.js Module to Get Distance Between two coordinates
In one of our latest projects at work, we need to calculate two world coordinates. Instead of going into details about how the calculations is made, I will just refer to this page. This explains all details of math involved in getting distances and/or bearings from lat/long pairs.
I have implemented this calculation in several languages in the last couple of months - both for work, but also for learning details about a language through implementing a known algorithm in it.
Here is a simple nodejs module extracted from the javascript code on that page. The module has one public method called getDistance.
My changes are released licensed under the WTFPL