calendat.icn: Procedure to get date from Julian Day Number

link calendat
March 25, 2002; Ralph E. Griswold
This file is in the public domain.

calendat(j) return a record with the month, day, and year corresponding
to the Julian Date Number j.
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Acknowledgement:  This procedure is based on an algorithm given in
"Numerical Recipes; The Art of Scientific Computing"; William H. Press,
Brian P. Flannery, Saul A. Teukolsky. and William T. Vetterling;
Cambridge University Press, 1986.

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