update ast 8.6.3

1 files changed, 119 insertions, 0 deletions

diff --git a/ast/erfa/tttai.c b/ast/erfa/tttai.c
new file mode 100644
index 0000000..0392aee
--- /dev/null
+++ b/ast/erfa/tttai.c
@@ -0,0 +1,119 @@
+#include "erfa.h"
+
+int eraTttai(double tt1, double tt2, double *tai1, double *tai2)
+/*
+**  - - - - - - - - -
+**   e r a T t t a i
+**  - - - - - - - - -
+**
+**  Time scale transformation:  Terrestrial Time, TT, to International
+**  Atomic Time, TAI.
+**
+**  Given:
+**     tt1,tt2    double    TT as a 2-part Julian Date
+**
+**  Returned:
+**     tai1,tai2  double    TAI as a 2-part Julian Date
+**
+**  Returned (function value):
+**                int       status:  0 = OK
+**
+**  Note:
+**
+**     tt1+tt2 is Julian Date, apportioned in any convenient way between
+**     the two arguments, for example where tt1 is the Julian Day Number
+**     and tt2 is the fraction of a day.  The returned tai1,tai2 follow
+**     suit.
+**
+**  References:
+**
+**     McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
+**     IERS Technical Note No. 32, BKG (2004)
+**
+**     Explanatory Supplement to the Astronomical Almanac,
+**     P. Kenneth Seidelmann (ed), University Science Books (1992)
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+
+/* TT minus TAI (days). */
+   static const double dtat = ERFA_TTMTAI/ERFA_DAYSEC;
+
+
+/* Result, safeguarding precision. */
+   if ( tt1 > tt2 ) {
+      *tai1 = tt1;
+      *tai2 = tt2 - dtat;
+   } else {
+      *tai1 = tt1 - dtat;
+      *tai2 = tt2;
+   }
+
+/* Status (always OK). */
+   return 0;
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  All rights reserved.
+**  
+**  This library is derived, with permission, from the International
+**  Astronomical Union's "Standards of Fundamental Astronomy" library,
+**  available from http://www.iausofa.org.
+**  
+**  The ERFA version is intended to retain identical functionality to
+**  the SOFA library, but made distinct through different function and
+**  file names, as set out in the SOFA license conditions.  The SOFA
+**  original has a role as a reference standard for the IAU and IERS,
+**  and consequently redistribution is permitted only in its unaltered
+**  state.  The ERFA version is not subject to this restriction and
+**  therefore can be included in distributions which do not support the
+**  concept of "read only" software.
+**  
+**  Although the intent is to replicate the SOFA API (other than
+**  replacement of prefix names) and results (with the exception of
+**  bugs;  any that are discovered will be fixed), SOFA is not
+**  responsible for any errors found in this version of the library.
+**  
+**  If you wish to acknowledge the SOFA heritage, please acknowledge
+**  that you are using a library derived from SOFA, rather than SOFA
+**  itself.
+**  
+**  
+**  TERMS AND CONDITIONS
+**  
+**  Redistribution and use in source and binary forms, with or without
+**  modification, are permitted provided that the following conditions
+**  are met:
+**  
+**  1 Redistributions of source code must retain the above copyright
+**    notice, this list of conditions and the following disclaimer.
+**  
+**  2 Redistributions in binary form must reproduce the above copyright
+**    notice, this list of conditions and the following disclaimer in
+**    the documentation and/or other materials provided with the
+**    distribution.
+**  
+**  3 Neither the name of the Standards Of Fundamental Astronomy Board,
+**    the International Astronomical Union nor the names of its
+**    contributors may be used to endorse or promote products derived
+**    from this software without specific prior written permission.
+**  
+**  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+**  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+**  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+**  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+**  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+**  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+**  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+**  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+**  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+**  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+**  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+**  POSSIBILITY OF SUCH DAMAGE.
+**  
+*/