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+.help amp Jun99 "Slalib Package"
+.nf
+
+      SUBROUTINE slAMP (RA, DA, DATE, EQ, RM, DM)
+
+     - - - -
+      A M P
+     - - - -
+
+  Convert star RA,Dec from geocentric apparent to mean place
+
+  The mean coordinate system is the post IAU 1976 system,
+  loosely called FK5.
+
+  Given:
+     RA       d      apparent RA (radians)
+     DA       d      apparent Dec (radians)
+     DATE     d      TDB for apparent place (JD-2400000.5)
+     EQ       d      equinox:  Julian epoch of mean place
+
+  Returned:
+     RM       d      mean RA (radians)
+     DM       d      mean Dec (radians)
+
+  References:
+     1984 Astronomical Almanac, pp B39-B41.
+     (also Lederle & Schwan, Astron. Astrophys. 134,
+      1-6, 1984)
+
+  Notes:
+
+  1)  The distinction between the required TDB and TT is
+      always negligible.  Moreover, for all but the most
+      critical applications UTC is adequate.
+
+  2)  The accuracy is limited by the routine slEVP, called
+      by slMAPA, which computes the Earth position and
+      velocity using the methods of Stumpff.  The maximum
+      error is about 0.3 milliarcsecond.
+
+  3)  Iterative techniques are used for the aberration and
+      light deflection corrections so that the routines
+      slAMP (or slAMPQ) and slMAP (or slMAPQ) are
+      accurate inverses;  even at the edge of the Sun's disc
+      the discrepancy is only about 1 nanoarcsecond.
+
+  4)  Where multiple apparent places are to be converted to
+      mean places, for a fixed date and equinox, it is more
+      efficient to use the slMAPA routine to compute the
+      required parameters once, followed by one call to
+      slAMPQ per star.
+
+  Called:  slMAPA, slAMPQ
+
+  P.T.Wallace   Starlink   19 January 1993
+
+  Copyright (C) 1995 Rutherford Appleton Laboratory
+  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+
+.fi
+.endhelp