This program accepts a year of the Jewish calendar, for example
"5750", and produces on the screen a calendar of that year with a 
visually equivalent civil calendar opposite it for easy conversion of 
dates. The months of the civil year are abbreviated to

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

and of the Jewish calendar to

NIS IYA SIV TAM AV ELU TIS HES KIS TEV SHE ADA AD2.

Months are normally displayed three at a time. You call up the next
three by hitting spacebar. At the end of the year you can indicate if
you wish the program to conclude, by hitting spacebar again. If in
response to the question, Do you wish to continue? you enter "y" and
hit return, the next year will be displayed.

Each Jewish month has its name on the left. The corresponding secular
dates will have the name of the month on the right, and when the month
changes it will be indicated on the right also.




If you wish, you may enter a civil year in the form -70 for BCE dates
and +70 for CE dates. The Jewish year beginning prior to Jan 1 of that
year will be displayed, and you can continue with the next Jewish year
if you wish to complete the desired civil year.

You may enter CE or AD instead of + or BC or BCE instead of the minus
sign if you wish. It is best to avoid spaces, so enter 1987AD, for
example.

The year 0 is not meaningful in either calendar. No date prior to 1 
in the Jewish calendar should be entered. The program will calculate
any future year, but will take longer for years much beyond the year
6000 in the Jewish reckoning. For example, the year 7000 will take
three minutes or so to appear if your machine is not very fast.
Earlier years should appear in a few seconds.

A status line at the bottom of the screen indicates the civil and
Jewish year, and the number of days in each. Jewish years may contain
354, 355, 356, 384, 385 or 386 days according to circumstances.




When you are familiar with this program you can enter the years you
wish to see on the command line. For example, if you call the program
   		iconx calendar 5704 +1987 1BC
you will see in turn the Jewish year 5704, the Jewish year commencing
in 1986 and the Jewish year commencing in 2 B.C.E. You still have the
option of seeing the years subsequent to these years if you wish. Just
enter "y" when asked if you want to continue. When you enter "n", you
will get the next year of your list.

All civil dates are according to the Gregorian Calendar which first
came into use in 1582 and was accepted in different places at
different times. Prior to that date the Julian calendar was in use. At
the present time the Julian calendar is 13 days behind the Gregorian
Calendar, so that March 15 1917 in our reckoning is March 2 in the
Julian Calendar. The following table shows the number of days that
must be subtracted from the Gregorian date given here to find the Julian
date. In the early centuries of this table and before, the calendar was
intercalated erratically, so a simple subtraction is not possible. Note that
the change in the number to subtract applies from March 1 in the century
year, since in the Julian Calendar that will be February 29 except in years
divisible by 400 which are leap years in the Gregorian calendar also.

Century		# to subtract		Century		# to subtract
  21			13		  11			6
  20			13		  10			5
  19			12		   9			4
  18			11		   8			4
  17			10		   7			3
  16			10		   6			2
  15			 9		   5			1
  14			 8		   4			1
  13			 7		   3			0
  12			 7		   2		       -1
  					   1		       -2