Sky2Pix_ZenithalEqualArea

class astropy.modeling.projections.Sky2Pix_ZenithalEqualArea(*args, **kwargs)[source] [edit on github]

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

Zenithal equidistant projection - sky to pixel.

Corresponds to the ZEA projection in FITS WCS.

See Zenithal for a definition of the full transformation.

\[\begin{split}R_\theta &= \frac{180^\circ}{\pi} \sqrt{2(1 - \sin\theta)} \\ &= \frac{360^\circ}{\pi} \sin\left(\frac{90^\circ - \theta}{2}\right)\end{split}\]

Methods Summary

evaluate(phi, theta)

Methods Documentation

classmethod evaluate(phi, theta)[source] [edit on github]