JD2MJD:

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   Converts Julian date to Modified Julian Date
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   Form:
   mJD = JD2MJD( jD )
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   ------
   Inputs
   ------
   jD           Julian date (days)

   -------
   Outputs
   -------
   mJD          Modified Julian date (days)

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Children:

Common: Time/Date2JD