radec_to_vector¶
- spherical_geometry.vector.radec_to_vector(lon, lat, degrees=True)¶
Converts a location on the unit sphere from longitude and latitude to an x, y, z vector.
- Parameters:
- lon, latscalars or 1-D arrays
- degreesbool, optional
If
True, (default) lon and lat are in decimal degrees, otherwise in radians.
- Returns:
- x, y, ztuple of scalars or 1-D arrays of the same length
Notes
Where longitude is l and latitude is b:
\[ \begin{align}\begin{aligned}x = \cos l \cos b\\y = \sin l \cos b\\z = \sin b\end{aligned}\end{align} \]