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- Pix2Sky_Mercator

# Pix2Sky_Mercator

class astropy.modeling.projections.Pix2Sky_Mercator(*args, **kwargs)

  Bases: `Pix2SkyProjection`, `Cylindrical`

  Mercator - pixel to sky.

  Corresponds to the `MER` projection in FITS WCS.

  \[\begin{split}\phi &= x \\ \theta &= 2 \tan^{-1}\left(e^{y \pi / 180^{\circ}}\right)-90^{\circ}\end{split}\]