Sky2Pix_HEALPixPolar

class astropy.modeling.projections.Sky2Pix_HEALPixPolar(*args, **kwargs)[source]

Bases: astropy.modeling.projections.Sky2PixProjection, astropy.modeling.projections.HEALPix

HEALPix polar, aka “butterfly” projection - pixel to sky.

Corresponds to the XPH projection in FITS WCS.