healpy.projaxes.GnomonicAxes.get_parallel_interval¶
- GnomonicAxes.get_parallel_interval(vx, vy=None, vz=None)¶
Get the min and max value of theta of the parallel to cover the field of view.
- Input:
- the normalized vector of the direction of the center of the projection, in the reference frame of the graticule.
- Return:
- vmin,vmax : between 0 and pi, vmin<vmax, the interval of theta
for the parallels crossing the field of view