ANGSEP

Name

angsep

Purpose

Compute the angular distance between two spherical coordinates.

Description

Calling Sequence

ans=angsep(ra1,dec1,ra2,dec2)

Inputs

ra1 - RA of first position (radians)
dec1 - Dec of first position (radians)
ra2 - RA of second position (radians)
dec2 - Dec of second position (radians)

Optional Input Parameters

Keyword Input Parameters

Outputs

return value is the angular distance in radians.

Keyword Output Parameters

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

Written by Marc W. buie, Lowell Observatory, 1997/09/08
2009/02/26, MWB, added protection against round off error generating NaN