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# Pix2Sky_Stereographic

class astropy.modeling.projections.Pix2Sky_Stereographic(*args, **kwargs)

  Bases: `Pix2SkyProjection`, `Zenithal`

  Stereographic Projection - pixel to sky.

  Corresponds to the `STG` projection in FITS WCS.

  See `Zenithal` for a definition of the full transformation.

  \[\theta = 90^{\circ} - 2 \tan^{-1}\left(\frac{\pi R_\theta}{360^{\circ}}\right)\]