EarthHelioState:

Path: Interplanetary/Ephemeris

% Compute the position and velocity of Earth in the heliocentric frame.
 Uses SunV1 and a first difference for velocity.
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   Form:
   [rHE, vHE] = EarthHelioState( jD )
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   ------
   Inputs
   ------
   jD          (1,1)   Julian date

   -------
   Outputs
   -------
   r           (3,1)	Position heliocentric
   v           (3,1)	Velocity heliocentric

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Children:

SC: Ephem/CEcl2Eq
SC: Ephem/SunV1
Common: Time/Date2JD

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