Pix2Sky_Stereographic¶

class astropy.modeling.projections.Pix2Sky_Stereographic(*args, **kwargs)[source]¶

Stereographic Projection - pixel to sky.

Corresponds to the STG projection in FITS WCS.

See Zenithal for a definition of the full transformation.

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