sunpy/sunpy — pull request #597 by wafels (2013-10-16 02:46:23+00:00)
Title: WCS: HG to HCC, and HCC to HG

This pull request more fully implements Eq. 11 and 12 of Thompson (2006), A&A, 449, 791 ("Coordinate systems for solar image data"). It also restores the ability to use the z-coordinate for the relevant functions that was in the sunpy/0.2 code but was dropped.