Earth revolves around the Sun once every year, or 365.25 days (most people use a 365-day calendar and take care of the extra 0.25 day by adding a day to the calendar every four years, creating a leap year)
2006-08-23 04:09:40 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Before the Gregorian calendar was adopted in 1582, the first day of spring was happening astronomically on March 11th. Christmas was being observed almost two weeks after the winter solstice.
So the calendar has to drop three leap years every 400 years. When the Gregorian calendar was adopted here in the US in September 1752, September 2 had to be followed by September 14, to make up for the 11 unnecessary leap-days that had been thrown in up to and including 1700.
2006-08-23 06:06:30 · answer #1 · answered by Anne Marie 6 · 0⤊ 1⤋
(copied from the link provided):
"In the Gregorian calendar currently in use worldwide (except perhaps the Russian and Iranian calendars), there is a leap year every year divisible by four except for years which are both divisible by 100 and not divisible by 400. Therefore, the year 2000 will be a leap year, but the years 1700, 1800, and 1900 were not. The complete list of leap years in the first half of the 21st century is therefore 2000, 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, 2040, 2044, and 2048."
2006-08-23 05:33:00 · answer #2 · answered by Krynne 4 · 0⤊ 0⤋
A leap-3 hundred and sixty 5 days occurs each 4 years because the size of a three hundred and sixty 5 days is about 365.25 days. Over a 4 3 hundred and sixty 5 days era, that promises as a lot as an entire day length, so we further an more desirable day. This 3 hundred and sixty 5 days is a leap 3 hundred and sixty 5 days, and after this one, 2012 stands out as the subsequent leap 3 hundred and sixty 5 days, and no, the international isn't going end.
2016-11-27 00:39:38 · answer #3 · answered by ? 4 · 0⤊ 0⤋
As far as I know, the rule is that if a year divides by 4, it's a leap year, unless it divides by 100, in which case it's not a leap year, unless it divides by 400, in which case it is a leap year again. 2000 divides evenly by 400, while 1900 doesn't.
http://en.wikipedia.org/wiki/Leap_year
2006-08-23 04:12:22 · answer #4 · answered by Anonymous · 0⤊ 0⤋
We will not have it in 2100 but will have it 2400. There is a 400 year cycle. To adjust the fraction days in a year
2006-08-23 04:12:18 · answer #5 · answered by Dr M 5 · 0⤊ 0⤋
Because the year is not exactly 365.2500 days long. It is about 365.2425 days long.
2006-08-23 04:12:02 · answer #6 · answered by campbelp2002 7 · 1⤊ 0⤋