Using the Haversine Formula in Drupal 7
This is a blog post copied from John's Website - please feel free to join him there and post comments. He has set up openid, so you can post there with your livejournal account using your openid, which is the same as your journal url minus the http://. You can find this entry at http://www.jcfiala.net/blog/2017/01/11/using-haversine-formula-drupal-7.
Here's a link to the article: https://www.newmediadenver.com/blog/using-haversine-formula-drupal7