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The Christian calendar has years that are 365 or 366 days long. It is
divided into 12 months that have no relationship to the motion of the moon,
and it employs a system of weeks that group the days in sets of 7. It had
three main versions: The Roman, the Julian and the Gregorian calendars, the
difference between which lies in the way they approximate the length of the
tropical year and in their rules for approximating the occurrence of
THE ROMAN CALENDAR
Originally, the year started on March 1, and consisted of only 304 days or
10 months (Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September,
October, November, and December). These 304 days were followed by an unnamed and unnumbered winter period. The Roman king Numa Pompilius (c. 715-673
BC, although his historicity is disputed) allegedly introduced February and January (in that order) between December and March, increasing the length
of the year to 354 or 355 days. In 450 BC, February was moved to its current position between January and March.
In order to make up for the lack of days in a year, an extra month, Intercalaris or Mercedonius, (allegedly with 22 or 23 days) was introduced in
some years. It was the duty of the priesthood to keep track of the calendars, but they failed miserably, partly due to ignorance, partly
because they were bribed to make certain years long and others short.
Furthermore, leap years were considered unlucky and were therefore avoided
in times of crisis, such as the Second Punic War. In order to clean up this
mess, Julius Caesar made his famous calendar reform in 45 BC. "Julius Caesar
made all odd numbered months 31 days long, and all even numbered months 30
days long (with February having 29 days in non-leap years). In 44 BC
Quintilis was renamed 'Julius' (July) in honor of Julius Caesar, and in 8 BC
Sextilis became 'Augustus' in honor of emperor Augustus. When Augustus had a
month named after him, he presumably wanted his month to be a full 31 days
long, so he removed a day from February and shifted the length of the other
months so that August would have 31 days. This fact, however, is not
confirmed, and could be a fabrication dating back to the 14th century.
THE JULIAN CALENDAR
It was introduced by Julius Caesar in 45 BC. It was in common use until the
1500s. However, some countries (Greece and Russia, for example) used it well
into this century. In the Julian calendar, the tropical year is approximated
as 365.25 days. This gives an error of 1 day in approximately 128 years. The
approximation 365 1/4 is achieved by having 1leap year every 4 years.
Furthermore, the way it calculated the Easter occurrence was inaccurate, it
had to be refined depending on the fact that most felt that 21 March was the
proper day for vernal equinox (because 21 March was the date for vernal
equinox during the Council of Nicaea in AD 325). The Gregorian calendar was
therefore calibrated to make that day vernal equinox. By 1582 vernal equinox
had moved (1582-325)/128 days = approximately 10 days backwards. So 10 days had to be dropped. This change in sequence of the calendar is known in
Islam as intercalation, which is prohibited to do for any reason.
THE GREGORIAN CALENDAR
The Gregorian calendar is commonly used today by the non-Muslims. Pope
Gregory XIII adopted it in accordance with instructions from the Council of
Trent (1545-1563). In the Gregorian calendar, the tropical year is
approximated as 365 97/400 days = 365.2425 days. Thus it takes approximately 3300 years for the tropical year to shift one day with respect to the
Gregorian calendar. The approximation 365 97/400 is achieved by having 97
leap years every 400 years.
In the Gregorian calendar, every year divisible by 4 is a leap year. Also,
every year divisible by 100 is not a leap year, but every year divisible by
400 is a leap year. And so, 1800, 1900 and 2100 are not leap years, while
1600 and 2000 are.
WHO USES THE GREGORIAN CALENDAR?
As we mentioned above not all countries adopted this calendar, and some of
those who did, had their own changes added to it. Italy, Poland, Portugal,
and Spain adopted it and other Catholic countries followed shortly after,
but Protestant countries were reluctant to change. Later, the Orthodox
Church in Greece decided to switch to the Gregorian calendar in the 1920s,
but they tried to improve on the Gregorian leap year rules, replacing the
"divisible by 400" rule.
Thus the beginning of their calendar is still different from the rest of the
Christian world. In an attempt to unify their Christmas and Easter
celebrations, both churches tried to change both Calendars. The meeting
happened in Aleppo, Syria (5-10 March 1997), organized by the World Council
of Churches and the Middle East Council of Churches, Representatives of
several churches and Christian world communions suggested that the
discrepancies between Easter calculations could be resolved by adopting calculations of the vernal equinox and the full moon. This new method for
calculating Easter should take effect from the year 2001.
The attached link reflects other efforts at dating how many day's in a year. After reviewing might I sugest you present to your family what you saw
here and let us all know there response.