diff options
Diffstat (limited to 'math/slalib/doc/bear.hlp')
| -rw-r--r-- | math/slalib/doc/bear.hlp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/math/slalib/doc/bear.hlp b/math/slalib/doc/bear.hlp new file mode 100644 index 00000000..97e4f13d --- /dev/null +++ b/math/slalib/doc/bear.hlp @@ -0,0 +1,30 @@ +.help bear Jun99 "Slalib Package" +.nf + + REAL FUNCTION slBEAR (A1, B1, A2, B2) + + - - - - - + B E A R + - - - - - + + Bearing (position angle) of one point on a sphere relative to another + (single precision) + + Given: + A1,B1 r spherical coordinates of one point + A2,B2 r spherical coordinates of the other point + + (The spherical coordinates are RA,Dec, Long,Lat etc, in radians.) + + The result is the bearing (position angle), in radians, of point + A2,B2 as seen from point A1,B1. It is in the range +/- pi. If + A2,B2 is due east of A1,B1 the bearing is +pi/2. Zero is returned + if the two points are coincident. + + P.T.Wallace Starlink 23 March 1991 + + Copyright (C) 1995 Rutherford Appleton Laboratory + Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. + +.fi +.endhelp |