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PRECESS_RES

PRECESS_RES

Name


      PRECESS_RES

Purpose


      Precess celestial coordinates to a new date.

Category


Calling Sequence


      precess_res, date1, ra1, dec1, date2, ra2, dec2

Inputs


      date1 = original date (like '1 Jan, 1950'). in.
      ra1 = original R.A. in hrs. in.
      dec1 = original Dec in deg. in.
      date2 = new date (like '25 Nov, 1987'). in.

Keyword Parameters


Keywords


        DRA=dra Returned Delta RA (hrs).
        DDEC=ddec Delta DEC (deg).

Outputs


      ra2 = new R.A. in hrs. out.
      dec2 = new Dec in deg. out.

Common Blocks


Notes


      Notes: Low accuracy. Use Goddard Astro Lib precess for
        better results.
     

Modification History


      R. Sterner. 25 Nov, 1987.
      Johns Hopkins University Applied Physics Laboratory.
      RES 17 Oct, 1989 --- converted to SUN.
      R. Sterner, 2004 Feb 03 --- renamed to avoid Goddard Astro Lib conflict.
      R. Sterner, 2004 Feb 03 --- rewrote. Still low accuracy.
  Copyright (C) 1987, Johns Hopkins University/Applied Physics Laboratory
  This software may be used, copied, or redistributed as long as it is not
  sold and this copyright notice is reproduced on each copy made. This
  routine is provided as is without any express or implied warranties
  whatsoever. Other limitations apply as described in the file disclaimer.txt.



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