Bases: astropy.modeling.projections.Sky2PixProjection, astropy.modeling.projections.Zenithal
Airy - sky to pixel.
Corresponds to the AIR projection in FITS WCS.
See Zenithal for a definition of the full transformation.
R_\theta = -2 \frac{180^\circ}{\pi}\left(\frac{\ln(\cos \xi)}{\tan \xi} + \frac{\ln(\cos \xi_b)}{\tan^2 \xi_b} \tan \xi \right)
where:
\xi &= \frac{90^\circ - \theta}{2} \\ \xi_b &= \frac{90^\circ - \theta_b}{2}
Parameters: | theta_b : float
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Attributes Summary
param_names | |
theta_b |
Methods Summary
evaluate(phi, theta, theta_b) |
Attributes Documentation
Methods Documentation