ECIToECIR:

Path: SC/Ephem

% Computes the transformation form ECI to ECIR. 
   ECIR is an inertially fixed frame that coincides with EF at jD.
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   Form:
   m = ECIToECIR( jD, eOfECalc )
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   ------
   Inputs
   ------
   jD          (1,1) Julian date
   eOfECalc    (1,1) Calculate the equation of the equinoxes

   -------
   Outputs
   -------
   m           (3,3) Julian date at which theta is zero

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   References:   Seidelmann, P. K., ed., The Explanatory Supplement to the 
                 Astronomical Almanac, University Science Books, 1992, p. 20.
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Children:

Common: Time/JD2T
SC: Ephem/EarthRot

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