CALENDAR FACTS found in internet

LEAP YEAR

International calendar

 


 

 

CALENDAR FACTS found in internet :


Time that the year has slowed since 1 A.D.: 1O seconds

The year as amended by Pope Gregory XIII (the Gregorian calendar):365 days, 5 hours, 48 minutes, 20 seconds

Date Pope Gregory reformed the calendar: 1582

Length of time the Julian calendar overestimates the solar year per year, as determined by Pope Gregory: 11 minutes, 14 seconds

Number of days Pope Gregory removed to correct the calendar's drift: 10

Dates Gregory eliminated by papal bull to realign his calendar with the solar year: October 5-14, 1582

Dates most Catholic countries accepted the Gregorian calendar: 1582 - 1584

Date Protestant Germany accepted the Gregorian calendar: partial acceptance in 1700, full acceptance in 1775

Date Great Britain (and the American colonies) accepted the Gregorian calendar: 1752

Date Japan accepted the Gregorian calendar: 1873

Date Russia accepted the Gregorian calendar: 1917 (and again in 1940)

Date China accepted the Gregorian calendar: 1949

Date the Eastern Orthodox Church last voted to reject the Gregorian calendar and retain the Julian calendar: 1971

Length of time the Gregorian calendar is off from the true solar year: 25.96768 seconds per year

Year in which the Gregorian calendar will be one day ahead of the true solar year: A.D. 4909

Year that Atomic Time replaced Earth Time as the world's official time standard: 1972


 

 

 

 

 

 

 

LEAP YEAR

Thirty days hath September,
April, June and November;
All the rest have thirty-one
Save February, she alone
Hath eight days and a score
Til leap year gives her one day more.

That's a handy little rhyme we learned at school, many long years ago,
but we were never told how come the numbers of days in the respective
months are so jumbled up. Nor why we have leap years. Probably our
teachers did not know.

It's a long story that really should begin with the Thoth calendar
invented in Egypt, 5000 years ago. From it, and the ancient Roman
calendar, Julius Caesar developed a better one. He and his nephew,
Augustus who succeeded him, were chiefly responsible for the names
of the twelve months in our calendar, the numbers of days in those
months, and for leap year.

Ours is a solar calendar in which a year is the time required for the
earth to complete its annual orbit around the sun. A day is the time
required -- 24 hours -- for the earth to make one complete revolution
on its axis. The necessity for leap years stem from the fact that there
are almost 365-1/4 days in a year. Consequently the common years
have 365 days but every fourth one which is exactly divisible by 4,
such as 1964, is a leap year with 366 days including 29 in February
instead of 28.

Actually, however, there are 365. 2422 days in a solar year -- 365
days, 5 hours, 48 minutes and 46 seconds. That is only 11 minutes and
14 seconds less than 365-1/4 (365. 25) days but in 125 years the
accumulated excess in the leap years amounts to a trifle more than one
day.

Therefore, in centesimal years not exactly divisible by 400 -- such as
1900, 1800 and 1700 -- there is no leap year. There was one in 1600
and there will be one in the year 2000. Because that slight excess in
leap years amounts to a trifle more than one day every 125 years, in
AD 4000 there will be no leap year. We thought you might be
interested.

The original Roman calendar had a 10-month year of only 304 days. It
began in Martius at the time of the vernal equinox. The second month
was Aprilis (when leaves and flowers opened), followed by Maius (the
time of growth), and Junius (the time of youth's maturity). The fifth
month was Quintilis (Latin for five), Sextilis (6), Septembris (7),
Octobris (8), Novembris (9) and Decembris (10). Numa Pompilius,
successor to the legendary Romulus, took care of the other 61 days by
adding Januarius (for Janis, the two-faced god, protector of gateways)
and Februarius (the time of sacrifices to atone for sins).

In 46 B. C., Julius Caesar, as Pontitex Maximus, decreed a new
calendar. In Egypt he had studied their Thoth calendar based upon a
solar year of 365-1/4 days. It included the 7-day week and "leap" years
borrowed from the Hebrew calendar. Its year had 12 months, each
with 30 days, ending with 5 or 6 days never used in public or private
transactions.

Julius Caesar's calendar distributed those surplus days alternately
among the 12 months. After his death, January became the first month
of a year and Quintilis was renamed Julius in his honor. Augustus
Caesar revised the Julian calendar. Sextilis became Augustus, with 31
days so that it would have as many as Julius, and September, October,
November and December have 30, 31, 30 and 31 days, respectively,
instead of 31, 30, 31 and 30 which is why we learned that handy little
rhyme.