NadGen:

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   Generate earth radius, nadir vector and sun vector data at the selected
   Julian dates. The sun vector includes the effects of parallax.
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   Form:
   [uNadir, eRadius, uSun] = NADGen( el, jDEpoch, jD )
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   ------
   Inputs
   ------
   el           (6)       Orbital elements
   jDEpoch                The Julian date corresponding to the mean anomaly
                          in el
   jD           (n)       Julian dates at which to compute the data

   -------
   Outputs
   -------
   uNadir       (3,n)     Nadir vectors
   eRadius      (n)       Earth radius
   uSun         (3,n)     Sun vectors

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Children:

Math: Linear/Mag
Math: Linear/Unit
Orbit: OrbitMechanics/RVOrbGen
SC: Ephem/SunV1