UT12TT:

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   Converts UT1 (time scale based on the rotation of the earth)
   to Terrestrial Time (also known as TT or terrestrial (dynamic)
   time). UT1 = TT - DT where DT is determined from astronomical
   observations.

   Since version 1.
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   Form:
   jDTT = UT12TT( jDUT1 )
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   ------
   Inputs
   ------
   jDUT1     (:,:) Julian date Universal Time 1

   -------
   Outputs
   -------
   jDTT      (:,:) Julian date Terrestrial (Dynamic) Time

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Children:

Common: Time/DeltaT