SUBROUTINE iau_LDSUN ( P, E, EM, P1 )
*+
*  - - - - - - - - - -
*   i a u _ L D S U N
*  - - - - - - - - - -
*
*  Deflection of starlight by the Sun.
*
*  This routine is part of the International Astronomical Union's
*  SOFA (Standards of Fundamental Astronomy) software collection.
*
*  Status:  support routine.
*
*  Given:
*     P        d(3)   direction from observer to star (unit vector)
*     E        d(3)   direction from Sun to observer (unit vector)
*     EM       d      distance from Sun to observer (au)
*
*  Returned:
*     P1       d(3)   observer to deflected star (unit vector)
*
*  Notes:
*
*  1) The source is presumed to be sufficiently distant that its
*     directions seen from the Sun and the observer are essentially
*     the same.
*
*  2) The deflection is restrained when the angle between the star and
*     the center of the Sun is less than a threshold value, falling to
*     zero deflection for zero separation.  The chosen threshold value
*     is within the solar limb for all solar-system applications, and
*     is about 5 arcminutes for the case of a terrestrial observer.
*
*  Called:
*     iau_LD       light deflection by a solar-system body
*
*  This revision:   2016 June 16
*
*  SOFA release 2023-10-11
*
*  Copyright (C) 2023 IAU SOFA Board.  See notes at end.
*
*-----------------------------------------------------------------------

      IMPLICIT NONE
      DOUBLE PRECISION P(3), E(3), EM, P1(3)

      DOUBLE PRECISION DLIM

* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

*  Deflection limiter (smaller for distant observers).
      DLIM = 1D-6 / MAX(EM*EM,1D0)

*  Apply the deflection.
      CALL iau_LD ( 1D0, P, P, E, EM, DLIM, P1 )

*  Finished.

*+----------------------------------------------------------------------
*
*  Copyright (C) 2023
*  Standards of Fundamental Astronomy Board
*  of the International Astronomical Union.
*
*  =====================
*  SOFA Software License
*  =====================
*
*  NOTICE TO USER:
*
*  BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND
*  CONDITIONS WHICH APPLY TO ITS USE.
*
*  1. The Software is owned by the IAU SOFA Board ("SOFA").
*
*  2. Permission is granted to anyone to use the SOFA software for any
*     purpose, including commercial applications, free of charge and
*     without payment of royalties, subject to the conditions and
*     restrictions listed below.
*
*  3. You (the user) may copy and distribute SOFA source code to others,
*     and use and adapt its code and algorithms in your own software,
*     on a world-wide, royalty-free basis.  That portion of your
*     distribution that does not consist of intact and unchanged copies
*     of SOFA source code files is a "derived work" that must comply
*     with the following requirements:
*
*     a) Your work shall be marked or carry a statement that it
*        (i) uses routines and computations derived by you from
*        software provided by SOFA under license to you; and
*        (ii) does not itself constitute software provided by and/or
*        endorsed by SOFA.
*
*     b) The source code of your derived work must contain descriptions
*        of how the derived work is based upon, contains and/or differs
*        from the original SOFA software.
*
*     c) The names of all routines in your derived work shall not
*        include the prefix "iau" or "sofa" or trivial modifications
*        thereof such as changes of case.
*
*     d) The origin of the SOFA components of your derived work must
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*
*     e) These requirements must be reproduced intact in any source
*        distribution and shall apply to anyone to whom you have
*        granted a further right to modify the source code of your
*        derived work.
*
*     Note that, as originally distributed, the SOFA software is
*     intended to be a definitive implementation of the IAU standards,
*     and consequently third-party modifications are discouraged.  All
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*
*  4. You shall not cause the SOFA software to be brought into
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*
*  5. The SOFA software is provided "as is" and SOFA makes no warranty
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*     SOFA representative has been advised of such damages, or for any
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*
*  6. The provision of any version of the SOFA software under the terms
*     and conditions specified herein does not imply that future
*     versions will also be made available under the same terms and
*     conditions.
*
*  In any published work or commercial product which uses the SOFA
*  software directly, acknowledgement (see www.iausofa.org) is
*  appreciated.
*
*  Correspondence concerning SOFA software should be addressed as
*  follows:
*
*      By email:  sofa@ukho.gov.uk
*      By post:   IAU SOFA Center
*                 HM Nautical Almanac Office
*                 UK Hydrographic Office
*                 Admiralty Way, Taunton
*                 Somerset, TA1 2DN
*                 United Kingdom
*
*-----------------------------------------------------------------------

      END