JD2DN:

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   Compute the day number from Julian date.
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   Form:
   dayNumber = JD2DN( jD )
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   ------
   Inputs
   ------
   jd            (1,1) Julian date

   -------
   Outputs
   -------
   dayNumber     (1,1) Day number
   year          (1,1) Year

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Children:

Common: Time/Date2DN
Common: Time/Date2JD
Common: Time/JD2Date