Sky2Pix_HammerAitoff¶
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class
astropy.modeling.projections.
Sky2Pix_HammerAitoff
[source] [edit on github]¶ Bases:
astropy.modeling.projections.Sky2PixProjection
,astropy.modeling.projections.PseudoCylindrical
Hammer-Aitoff projection - sky to pixel.
Corresponds to the
AIT
projection in FITS WCS.x &= 2 \gamma \cos \theta \sin \frac{\phi}{2} \\ y &= \gamma \sin \theta
where:
\gamma = \frac{180^\circ}{\pi} \sqrt{\frac{2}{1 + \cos \theta \cos(\phi / 2)}}
Methods Summary
evaluate
(phi, theta)Methods Documentation
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classmethod
evaluate
(phi, theta)[source] [edit on github]¶
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classmethod