hcal4unx.icn: Program for Jewish/Civil calendar in UNIX

This work is respectfully devoted to the authors of two books
consulted with much profit: "A Guide to the Solar-Lunar Calendar"
by B. Elihu Rothblatt published by our sister Hebrew Dept. in
Madison, Wis., and "Kiddush HaHodesh" by Rabbenu Moses ben Maimon,
on whom be peace.

The Jewish year harmonizes the solar and lunar cycle, using the
19-year cycle of Meton (c. 432 BCE). It corrects so that certain
dates shall not fall on certain days for religious convenience. The
Jewish year has six possible lengths, 353, 354, 355, 383, 384, and
385 days, according to day and time of new year lunation and
position in Metonic cycle.  Time figures from 6pm previous night.
The lunation of year 1 is calculated to be on a Monday (our Sunday
night) at ll:11:20pm. Our data table begins with a hypothetical
year 0, corresponding to 3762 B.C.E.  Calculations in this program
are figured in the ancient Babylonian unit of halaqim "parts" of
the hour = 1/1080 hour.

Startup syntax is simply hebcalen [date], where date is a year
specification of the form 5750 for a Jewish year, +1990 or 1990AD
or 1990CE or -1990 or 1990BC or 1990BCE for a civil year.
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Revised October 25, 1993 by Ralph E. Griswold to use dopen().