— Function: antik:polar-to-rectangular azimuth elevation &optional radius sign1

Convert polar coordinates to rectangular coordinates. Argument sign1 should be set to -1 for accomodating topocentric azimuth, which is measured from North instead of South.

— Function: antik:rectangular-to-polar vector &optional sign1

Convert rectangular coordinates to polar coordinates. Argument sign1 should be set to -1 for accomodating topocentric azimuth, which is measured from North instead of South. Returns a list of azimuth, elevation, and radius, and the plane distance.