Sky2Pix_Mercator¶

class astropy.modeling.projections.Sky2Pix_Mercator(*args, **kwargs)[source]¶

Mercator - sky to pixel.

Corresponds to the MER projection in FITS WCS.

\[\begin{split}x &= \phi \\ y &= \frac{180^{\circ}}{\pi}\ln \tan \left(\frac{90^{\circ} + \theta}{2}\right)\end{split}\]