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# Pix2Sky_Parabolic

class astropy.modeling.projections.Pix2Sky_Parabolic(*args, **kwargs)

  Bases: `Pix2SkyProjection`, `PseudoCylindrical`

  Parabolic projection - pixel to sky.

  Corresponds to the `PAR` projection in FITS WCS.

  \[\begin{split}\phi &= \frac{180^\circ}{\pi} \frac{x}{1 - 4(y / 180^\circ)^2} \\ \theta &= 3 \sin^{-1}\left(\frac{y}{180^\circ}\right)\end{split}\]