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| author | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-07-08 20:46:52 -0400 |
|---|---|---|
| committer | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-07-08 20:46:52 -0400 |
| commit | fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 (patch) | |
| tree | bdda434976bc09c864f2e4fa6f16ba1952b1e555 /math/slalib/doc/dbear.hlp | |
| download | iraf-linux-fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4.tar.gz | |
Initial commit
Diffstat (limited to 'math/slalib/doc/dbear.hlp')
| -rw-r--r-- | math/slalib/doc/dbear.hlp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/math/slalib/doc/dbear.hlp b/math/slalib/doc/dbear.hlp new file mode 100644 index 00000000..8d796e61 --- /dev/null +++ b/math/slalib/doc/dbear.hlp @@ -0,0 +1,30 @@ +.help dbear Jun99 "Slalib Package" +.nf + + DOUBLE PRECISION FUNCTION slDBER (A1, B1, A2, B2) + + - - - - - - + D B E R + - - - - - - + + Bearing (position angle) of one point on a sphere relative to another + (double precision) + + Given: + A1,B1 d spherical coordinates of one point + A2,B2 d 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 |