Name

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      PRECESS_RES

Purpose

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      Precess celestial coordinates to a new date.

Category

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Calling Sequence

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

Inputs

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      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

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Keywords

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

Outputs

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

Common Blocks

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Notes

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

Modification History

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      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.