section j of routines in kepler.i

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jpl_planets |
                 jpl_planets

      orbital elements from http://ssd.jpl.nasa.gov/elem_planets.html
      "Mean orbit solutions from a 250 yr. least squares fit of the
      DE200 planetarty ephemeris to a Keplerian orbit where each element
      is allowed to vary linearly with time.  This solution fits the
      terrestrial planets to 25" or better, but achieves only 600" for
      Saturn.  Elements are referenced to mean ecliptic and equinox
      of J2000 at the J2000 epoch (2451545.0 JD)."
      J2000 = 2000 January 1.5

      WARNING: these elements are 1.5 JD later than sch_planets

      definitions:
      argument of perihelion = longitude of perihelion -
                               longitude of ascending node
      mean anomaly = mean longitude - longitude of perihelion
      1 Julian century = 36525 days

    keyword,  defined at i/kepler.i   line 434