HLE:

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   Computes the leading edge dihedral angle for a spinning spacecraft.
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   Form:
   lE = HLE( uA, uS, uE, earthRadius, cant )
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   ------
   Inputs
   ------
   uA                     Spacecraft unit vector
   uS           (3,n)     Unit sun vectors
   uE           (3,n)     Unit nadir vectors
   earthRadius
   cant

   -------
   Outputs
   -------
   lE           (n)       Leading edge dihedral angle

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Children:

Common: Graphics/NewFig
Math: Linear/Cross
Math: Linear/Dot
Math: Linear/Unit
SAAD: SAAttDet/HCw