Bases: astropy.modeling.projections.Sky2PixProjection, astropy.modeling.projections.Conic
Conic equidistant projection - sky to pixel.
Corresponds to the COD projection in FITS WCS.
See Conic for a description of the entire equation.
The projection formulæ are:
C &= \frac{180^\circ}{\pi} \frac{\sin\theta_a\sin\eta}{\eta} \\ R_\theta &= \theta_a - \theta + \eta\cot\eta\cot\theta_a \\ Y_0 = \eta\cot\eta\cot\theta_a
Parameters: | sigma : float
delta : float
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Attributes Summary
param_names |
Methods Summary
evaluate(phi, theta, sigma, delta) |
Attributes Documentation
Methods Documentation