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# Sky2Pix_Stereographic

class astropy.modeling.projections.Sky2Pix_Stereographic(*args, **kwargs)

  Bases: `Sky2PixProjection`, `Zenithal`

  Stereographic Projection - sky to pixel.

  Corresponds to the `STG` projection in FITS WCS.

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

  \[R_\theta = \frac{180^{\circ}}{\pi}\frac{2 \cos \theta}{1 + \sin \theta}\]