jeffkaufman/trycontra — pull request #2 by yoz (2013-11-28 04:28:27+00:00)
Title: Use mid-latitude cosine approximation for longitudinal distance.

The current distance metric makes east-west distances longer and north-south distances shorter than they should be. Here's the list of places where the resulting list changes, which is a significant number of them:

https://gist.github.com/yoz/0781d30b5172b3cda9d1