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Egypt adopted a leap year system, with an extra day every four years, at some point during the Greek rule of the Ptolemaic dynasty (305 to 30 B.C.).
The last Ptolemaic ruler, Cleopatra, was at least indirectly responsible for introducing the concept to Julius Caesar. In 46 B.C., Julius instituted a single year some 445 days long -- later known as the Year of Confusion. 45 B.C. saw a calendar of years with 365 days and one extra day every four years. The problem was, that formula resulted in one day too many every 128 years. From the time the Julian calendar was adopted to the start of the 16th century that error meant the equinox had shifted (was off) by ten days.
The Gregorian calendar (which we (most of us) currently use) was first adopted in Italy, Poland, Portugal and Spain in 1582
The Gregorian reform consisted of the following changes:
10 days were dropped in October 1582.
New rules were set to determine the date of Easter.
The rule for calculating Leap Years was changed to include that a year is a Leap Year if:
The year is evenly divisible by 4;
If the year can be evenly divided by 100, it is NOT a leap year,
Unless the year is also evenly divisible by 400. Then it IS a leap year.
Sweden had a complicated transition to the Gregorian calendar; they officially experienced February 30, 1712. [B][COLOR="#0000FF"]The Gregorian calendar wasn't adopted in Great Britain and [U]America[/U] until September 1752, when 11 days were dropped to switch to the Gregorian calendar.[/COLOR][/B] Japan replaced its lunisolar calendar with the Gregorian calendar in January 1873, but decided to use the numbered months it had originally used rather than the European names. The Republic of China originally adopted the Gregorian calendar in January 1912, but it wasn't used in China due to warlords using different calendars. However, the Nationalist Government formally decreed the adoption of the Gregorian calendar in China in January 1929. There is some implication that the traditional Ethiopian calendar, based upon the ancient Egyptian calendar, is now lagging
What else can I help you with?
Is 1996 a leap year?
The first leap year after 1996 was 2000. The first one after 2010 is 2012.
Is 1520 a leap year?
No. The first leap year was not until 1752.
What is the leap year after 1990?
1992 was the first leap year after 1990.
Was 1798 a leap year?
Yes, 1804 was a leap year. Any year whose number is evenly divisible by four is a leap year, with two exceptions. Any year whose number is evenly divisible by 100 is NOT a leap year. Any year evenly divisible by 400 IS a leap year. So, 1800 was not a leap year, while 1804 WAS a leap year. 1900 was not a leap year, while 2000 (being divisible by 400) was a leap year.
When was the first leap year according to the Royal Greenwich Observatory?
the first leap year was in 1582
Will year 2100 be a leap year?
Nope. The first leap year of the 2100s will be the year 2104.
When was the next leap year after 1899?
The first leap year after 1899 was 1904.
What is a Non leap year that begins on a Wednesday after 2010?
The first non-leap year after 2010 is 2011. The year 2012 is a leap year.
What is the first leap year in the 31st century?
The first leap year of the 31st century will be 3004. It will be a leap year starting on Sunday, like 1984, 2012 and 2040.
What is the first year in the first century?
The first leap year of the 31st century will be 3004. It will be a leap year starting on Sunday, like 1984, 2012 and 2040.
When was the first leap year?
It was in 1752.1948
What is the year after the third leap year of this century?
2013 Actually, the first leap year was 2000, and the second was 2004. The third was 2008. Therefore, the year after the third leap year of this century was really 2009.
