EULER

     Transform between Galactic, celestial, and ecliptic coordinates.

     Use the procedure ASTRO to use this routine interactively

      EULER, AI, BI, AO, BO, [ SELECT, /FK4, SELECT = ]

       AI - Input Longitude in DEGREES, scalar or vector.  If only two
               parameters are supplied, then  AI and BI will be modified to
               contain the output longitude and latitude.
       BI - Input Latitude in DEGREES

       SELECT - Integer (1-6) specifying type of coordinate transformation.
      SELECT   From          To        |   SELECT      From            To
       1     RA-Dec (2000)  Galactic   |     4       Ecliptic      RA-Dec
       2     Galactic       RA-DEC     |     5       Ecliptic      Galactic
       3     RA-Dec         Ecliptic   |     6       Galactic      Ecliptic
      If not supplied as a parameter or keyword, then EULER will prompt for
      the value of SELECT
      Celestial coordinates (RA, Dec) should be given in equinox J2000
      unless the /FK4 keyword is set.

       AO - Output Longitude in DEGREES
       BO - Output Latitude in DEGREES

       /FK4 - If this keyword is set and non-zero, then input and output
             celestial and ecliptic coordinates should be given in equinox
             B1950.
       /SELECT  - The coordinate conversion integer (1-6) may alternatively be
              specified as a keyword

       EULER was changed in December 1998 to use J2000 coordinates as the
       default, ** and may be incompatible with earlier versions***.

       Written W. Landsman,  February 1987
       Adapted from Fortran by Daryl Yentis NRL
       Converted to IDL V5.0   W. Landsman   September 1997
       Made J2000 the default, added /FK4 keyword  W. Landsman December 1998
       Add option to specify SELECT as a keyword W. Landsman March 2003

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