ICSN:

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   Initial quaternion and solar array angle given the sun geometry.
   Given an inertial frame defined with the sun in the +ZY plane, compute
   the initial spacecraft quaternion and solar array angle given the sun
   beta angle and alpha, the angle between the spacecraft and the sun
   projection in the ZX plane.
   See also SunNadir.

   Since version 1.
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   Form:
   [q, sAAngle, w] = ICSN( xNoSun, orbitRate, beta, alpha, alphaLimit )
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   Inputs
   ------
   xNoSun        (1,1) Either +1 for +x or -1 for -x
   orbitRate     (1,1) Orbit rate
   beta          (1,1) Angle from orbit plane to the sun (rad)
   alpha         (1,1) Angle from the sun line in the orbit plane
   alphaLimit    (1,1) Range of alpha during which the rate limit is to be enforced

   -------
   Outputs
   -------
   q             (4,1) Quaternion
   saAngle       (1,1) Solar array angle
   w             (3,1) Body rate

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Children:

Common: Quaternion/Mat2Q
SC: Ephem/SunNadir