HEALPix is an acronym for Hierarchical Equal Area isoLatitude Pixelization
 of a sphere. As suggested in the name, this pixelization produces a
 subdivision of a spherical surface in which each pixel covers the same
 surface area as every other pixel. It is commonly used to store all-sky
 astronomical images, most famously maps of the cosmic microwave background.
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 This is a BSD-licensed HEALPix package developed by the Astropy project
 and based on C code written by Dustin Lang in astrometry.net.
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 This package provides modules for Python 3.