Repatch (from linux) of OSX IRAF

1 files changed, 59 insertions, 0 deletions

diff --git a/math/slalib/doc/de2h.hlp b/math/slalib/doc/de2h.hlp
new file mode 100644
index 00000000..7e5bcb06
--- /dev/null
+++ b/math/slalib/doc/de2h.hlp
@@ -0,0 +1,59 @@
+.help de2h Jun99 "Slalib Package"
+.nf
+
+      SUBROUTINE slDE2H (HA, DEC, PHI, AZ, EL)
+
+     - - - - -
+      D E 2 H
+     - - - - -
+
+  Equatorial to horizon coordinates:  HA,Dec to Az,El
+
+  (double precision)
+
+  Given:
+     HA      d     hour angle
+     DEC     d     declination
+     PHI     d     observatory latitude
+
+  Returned:
+     AZ      d     azimuth
+     EL      d     elevation
+
+  Notes:
+
+  1)  All the arguments are angles in radians.
+
+  2)  Azimuth is returned in the range 0-2pi;  north is zero,
+      and east is +pi/2.  Elevation is returned in the range
+      +/-pi/2.
+
+  3)  The latitude must be geodetic.  In critical applications,
+      corrections for polar motion should be applied.
+
+  4)  In some applications it will be important to specify the
+      correct type of hour angle and declination in order to
+      produce the required type of azimuth and elevation.  In
+      particular, it may be important to distinguish between
+      elevation as affected by refraction, which would
+      require the "observed" HA,Dec, and the elevation
+      in vacuo, which would require the "topocentric" HA,Dec.
+      If the effects of diurnal aberration can be neglected, the
+      "apparent" HA,Dec may be used instead of the topocentric
+      HA,Dec.
+
+  5)  No range checking of arguments is carried out.
+
+  6)  In applications which involve many such calculations, rather
+      than calling the present routine it will be more efficient to
+      use inline code, having previously computed fixed terms such
+      as sine and cosine of latitude, and (for tracking a star)
+      sine and cosine of declination.
+
+  P.T.Wallace   Starlink   9 July 1994
+
+  Copyright (C) 1995 Rutherford Appleton Laboratory
+  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+
+.fi
+.endhelp