Sky2Pix_Parabolic

class astropy.modeling.projections.Sky2Pix_Parabolic(*args, **kwargs)[source] [edit on github]

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

Parabolic projection - sky to pixel.

Corresponds to the PAR projection in FITS WCS.

\[\begin{split}x &= \phi \left(2\cos\frac{2\theta}{3} - 1\right) \\ y &= 180^\circ \sin \frac{\theta}{3}\end{split}\]

Methods Summary

evaluate(phi, theta)

Methods Documentation

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