Description:
Angle between two points on a
sphere.
Invocation
ang = palDsep( double a1, double b1, double a2, double b2 );
Arguments
a1 = double (Given)
Spherical coordinate of one point (radians)
b1 = double (Given)
Spherical coordinate of one point (radians)
a2 = double (Given)
Spherical coordinate of other
point (radians)
b2 = double (Given)
Spherical coordinate of other point (radians)
Returned Value
Angle, in radians, between the two points. Always positive.
Notes:
-
The spherical coordinates are [RA,Dec], [Long,Lat] etc, in radians.
-
Uses eraSeps(). See SOFA/ERFA documentation for details.
Copyright © 2012 Science and Technology Facilities Council.
Copyright © 2014 Cornell University.
Copyright © 2015 Tim Jenness