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.help sep Jun99 "Slalib Package"
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REAL FUNCTION slSEP (A1, B1, A2, B2)
- - - -
S E P
- - - -
Angle between two points on a sphere (single precision)
Given:
A1,B1 real spherical coordinates of one point
A2,B2 real spherical coordinates of the other point
(The spherical coordinates are RA,Dec, Long,Lat etc, in radians.)
The result is the angle, in radians, between the two points. It
is always positive.
Called: slCS2C
P.T.Wallace Starlink April 1985
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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