Path: SC/Ephem

% Get positions for an array of planets using the JPL ephemeris.
 Gives the position vectors, gravitational parameters and velocity
 for the planets. The frame is heliocentric and can be either in the Earth's 
 equatorial plane (default) or the ecliptic plane. 
 Modeled after PlanetPosition.

     0. Sun (at origin)
     1. Mercury
     2. Venus
     3. Earth
     4. Mars
     5. Jupiter
     6. Saturn
     7. Uranus
     8. Neptune
     9. Pluto
    10. Geocentric Moon
    11. Earth-Moon Barycenter

 This calls the function InterpolateState which returns planet states in the
 Earth equatorial frame and measured from the solar system barycenter.

 You must first initialize this function with a set of planet IDs and then
 you can retrieve the states for a specific Julian date.
                PlanetPosJPL( 'initialize', id )
   [r, mu, v] = PlanetPosJPL( 'update', jD, ecl )

   action    (1,:)       'initialize' or 'update'
   id  or jD	(1,n)       Julian date (days) for update or planet ids
   ecl       (1,1)       Flag for ecliptic plane (1), default is equatorial (0)

   r         (3,n)       Planetary position vectors
   mu        (1,n)       Corresponding gravitational parameters
   v         (3,n)       Velocity vectors



Common: Time/Date2JD
SC: Ephem/CEcl2Eq
SC: Ephem/InterpolateState

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