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clock2.doc
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1988-08-11
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The Various Calendars
The program will assist in converting dates
between different calendars. Calendars implemented in this
version of the program (1.0) are the Julian, Gregorian,
ancient Egyptian, Alexandrian (and later Coptic), ancient
Roman, Nabonassar (used by ancient astronomers), Islamic,
French Revolutionary, and Zodiacal. The user enters the
year (according to the specific era, using Roman or Arabic
numerals), the month and the day, but the Julian day number
can also be used. In the case of the old, pre-Julian Roman
calendar, whose course is still being debated, a selection
of scholarly theories is presented.
The information provided by the program contains,
besides the obvious date conversions, the Julian day number,
the day of the week, the age of the moon (both
astronomically and in the first centuries of our era,
according to papyrus Carlsberg 9), the Roman indiction, and
other information pertaining to this particular historical
period.