Add references for solid angle computation improvements
@@ -776,7 +776,10 @@ class WcsGeom(MapGeom):
# Compute solid angle across centres of the pixels, approximating it
# as a rectangle
# First index is "y", second index is "x"
- # TODO: Calculate actual solid angle between two great circles?
+ # TODO: Calculate actual solid angle between two great circles? Here are two references
+ # suggesting more precise methods:
+ # https://mail.python.org/pipermail/astropy/2013-December/002632.html
+ # https://cta-redmine.irap.omp.eu/issues/1017
lon_centres = (lon[..., :-1, :-1] + lon[..., 1:, 1:]) / 2
lat_centres = (lat[..., :-1, :-1] + lat[..., 1:, 1:]) / 2
