update ast 8.6.3

1 files changed, 77 insertions, 0 deletions

diff --git a/ast/pal/palDtt.c b/ast/pal/palDtt.c
new file mode 100644
index 0000000..f6a3714
--- /dev/null
+++ b/ast/pal/palDtt.c
@@ -0,0 +1,77 @@
+/*
+*+
+*  Name:
+*     palDtt
+
+*  Purpose:
+*     Return offset between UTC and TT
+
+*  Language:
+*     Starlink ANSI C
+
+*  Type of Module:
+*     Library routine
+
+*  Invocation:
+*     dtt = palDtt( double utc );
+
+*  Arguments:
+*     utc = double (Given)
+*        UTC date as a modified JD (JD-2400000.5)
+
+*  Returned Value:
+*     dtt = double
+*        TT-UTC in seconds
+
+*  Description:
+*     Increment to be applied to Coordinated Universal Time UTC to give
+*     Terrestrial Time TT (formerly Ephemeris Time ET)
+
+*  Authors:
+*     TIMJ: Tim Jenness (JAC, Hawaii)
+*     PTW: Patrick T. Wallace
+*     {enter_new_authors_here}
+
+*  Notes:
+*     - Consider a comprehensive upgrade to use the time transformations in SOFA's time
+*       cookbook:  http://www.iausofa.org/sofa_ts_c.pdf.
+*     - See eraDat for a description of error conditions when calling this function
+*       with a time outside of the UTC range. This behaviour differs from slaDtt.
+
+*  History:
+*     2012-02-08 (TIMJ):
+*        Initial version
+*        Adapted with permission from the Fortran SLALIB library.
+*     {enter_further_changes_here}
+
+*  Copyright:
+*     Copyright (C) 1995 Rutherford Appleton Laboratory
+*     Copyright (C) 2012 Science and Technology Facilities Council.
+*     All Rights Reserved.
+
+*  Licence:
+*     This program is free software: you can redistribute it and/or
+*     modify it under the terms of the GNU Lesser General Public
+*     License as published by the Free Software Foundation, either
+*     version 3 of the License, or (at your option) any later
+*     version.
+*
+*     This program is distributed in the hope that it will be useful,
+*     but WITHOUT ANY WARRANTY; without even the implied warranty of
+*     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*     GNU Lesser General Public License for more details.
+*
+*     You should have received a copy of the GNU Lesser General
+*     License along with this program.  If not, see
+*     <http://www.gnu.org/licenses/>.
+
+*  Bugs:
+*     {note_any_bugs_here}
+*-
+*/
+
+#include "pal.h"
+
+double palDtt( double utc ) {
+  return 32.184 + palDat( utc );
+}