JDToMidnight:

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   Converts a Julian date to the nearest midnight.

   Since version 10.
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   Form:
    jDMid = JDToMidnight( jD )
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   ------
   Inputs
   ------
   jD           (:)  Julian date

   -------
   Outputs
   -------
   jDMid        (:)  Julian midnights

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Children:

Common: Time/JD2000