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.

this package provides the static library and headers for the c language implementation of healpix. the c library provides basic input/output of healpix maps as well as basic spatial operations like conversion between spherical coordinates and healpix pixels.