JPLEPHTEST

   Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770
   craigm@lheamail.gsfc.nasa.gov
   UPDATED VERSIONs can be found on my WEB PAGE:
      http://cow.physics.wisc.edu/~craigm/idl/idl.html

   Test JPLEPHTEST with JPL test data set

   Planetary Orbits, Interpolation

   JPLEPHTEST, EPHFILE, TESTFILE

   JPLEPHTEST tests the JPLEPHINTERP procedure for precision.  In
   order to function, you must have a JPL ephemeris test data set.
   The test data set testpo.405 is available in
   ftp://idlastro.gsfc.nasa.gov/pub/data
   The procedure opens and reads the test set, which contains
   precomputed data.  Every tenth value is printed on the screen.
   Any deviations that exceed 1.5d-13 AU = 1.5 cm are reported.
   The columns are labelled according to the input file, except for
   the final column, which is the deviation between the input file
   and the computed value.

   EPHFILE - a scalar string, specifies the name of the ephemeris
             file, in FITS format.    JPLEPHTEST will look in the directory
             $ASTRO_DATA for the file if it is not in the current directory.
   TESTFILE - a scalar string, specifies JPL test data set to compare
              against.   JPLEPHTEST will look in the directory
             $ASTRO_DATA for the file if it is not in the current directory.

   Test JPL DE200 and DE405 ephemerides.  Assumes files are in the
   current directory.
   JPLEPHTEST, 'JPLEPH.200', 'testpo.200'
   JPLEPHTEST, 'JPLEPH.405', 'testpo.405'

   JPL Export Ephemeris FTP Site
      ftp://navigator.jpl.nasa.gov/pub/ephem/export/
      (see test-data/ for test data sets)
   HORIZONS, JPL Web-based ephermis calculator (Ephemeris DE406)
      http://ssd.jpl.nasa.gov/horizons.html

   JPLEPHREAD, JPLEPHINTERP, JPLEPHTEST

   Written and Documented, CM, Jun 2001
   Removed TRANSREAD, improved output, improved docs, CM, 9 Jul 2001
  $Id: jplephtest.pro,v 1.4 2001/07/20 13:29:53 craigm Exp $

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