Sky2Pix_Stereographic¶

class astropy.modeling.projections.Sky2Pix_Stereographic(*args, **kwargs)[source]¶

Stereographic Projection - sky to pixel.

Corresponds to the STG projection in FITS WCS.

See Zenithal for a definition of the full transformation.

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