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The length of a year, as most people know it, is 365 days. This is actually not exact, as the length of the year is 365.25 days, as denoted by the time it takes our planet to …circle the sun once. Since calendars don't show portions of a day, that quarter is 'lost' every year. But if we keep on losing time to the sun, our seasons would, over time, change around. So if you live in London, say, you will find in the year 2727, or so, that London has it's Christmas in the middle of summer, and Wimbledon will be cancelled, or at least moved to Christmas, as it would be too cold & wet to play in July. Anyway, to get back to the answer: this quarter day has to be added to the calendar, so every four years we add the four quarters of the preceding four years, to form a full day, and we add that to February, as you'll know. The general rule is that if the year is divisible by four, it's a leap year, like 2008. Certain exceptions apply, as in 2000 (which obviously is divisible by 4), but wasn't a leap year. Why that is I don't know, perhaps someone that does could add to this. (MORE)

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In Leap Year

Julius Caesar created leap year. Every fourth year and every year divisible by four has 366 days instead of 365.

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In Leap Year

The actual solar year, the time it takes to go around the sun one time is just a little longer than 365 days. Leap year makes up for that. Since it takes 365 and 1/4 days for… the earth to revolve around the sun, one day needs to be added every four years (Feb. 29th) so that the calendar and seasons don't get out of whack. (Otherwise, after about 730 years, summer would be in what are now the winter months, and winter would be in what are now the summer months.) And because there is really 365 days, 6h, 9mins so that 6hrs 9mins turn into a whole day Roughly speaking it takes the Earth 365 and a quarter days to circle the sun, which is called a year. So every 4 years we need the extra day to stop the calendar from getting out of line with the sun. Certain days in the calendar are linked to the sun eg it should be overhead at noon on the vernal equinox (Mar 20) at the Tropic of Cancer. It actually takes 364 1/4 days for the sun to rotate the earth. So, every four years we throw in an extra day to make up those four quarter days. It actually takes the Earth 365.25 days to orbit the Sun, so an extra day is added every four years to compensate. Earth travels around the sun once (approximately) every 365.25 earth days. A quarter day cannot be added into a year, therefore an extra day is added (as February 29th, Feb. being the shortest month) every 4 years. That year is called a leap year due to the leap of 4 quarter days to 'catch up,' causing a 366 day year. More Information: 1. The addition of a day, Feb. 29th, to the Gregorian calendar, every 4th year to compensate for the difference between the calendar year and the actual orbital year. The calculation to identify these years is: years whose last two digits are evenly divisible by four, except for centenary years not divisible by 400. 2. The addition to a given year, of a day or month for any calendar. Leap years are necessary because the time it takes the earth to orbit the sun is not an exact multiple of a day. It takes roughly 365.22 days per orbit. The calendar ordered by Julius Caesar (Julian Calendar) rounded that down to 365. Of course, that's not nearly enough; those extra 22/100 of a day each year add up pretty quickly, which is why every fourth year of the Julian calendar has 366 days. If the earth's orbit took 365.25 days, that would have been good enough. In fact it was considered good enough for over a millennium. Eventually the offset caused by that extra 3/100 of a day per year accumulating for many hundreds of years could no longer be ignored, so Pope Gregory ordered a refinement of the Julian calendar (the Gregorian Calendar, which we use today). The Gregorian Calendar includes the extra rule that the last year of every century is a leap year ONLY if the year is evenly divisible by 400. the Gregorian calendar has a leap year because every year has 365 days and a quarter of a day so every four years we make up for those quarters by having an extra day which makes a leap year. there is an extra quarter of a day at the end of a year so every 4 years we put them together to make a whole day (MORE)

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In Leap Year

The rules are that a year must be divisible by 4 but not by 100 unless it's divisible by 400. 1952 1956 1960 1964 1968 1972 1976 1980 1984 1988 1992 1996 2000 2004 …2008 2000 is divisible by 400 so it is a leap year. 1900 wasn't and neither will 2100 be (MORE)

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In Leap Year

Probably because the date "leaps" forward. In real terms it should be called a leap day. Leap years are called leap years because of the effect is has on the fol…lowing calendar dates for the next year. For example in a normal 365 day year, if a calendar date fell on Monday this year will be on a Tuesday next year, but the leap day alters the direction of the calendar cycle so if a calendar date was on a Monday and there is a leap day involved in the next year, the same date the following year will be forced to Wednesday (skipping the Tuesday). Leap years are necessary because the Earth completes exactly one revolution round the Sun in 365 days plus a little less than 6 hours. So usually a leap year every 4 years brings the calendar back in line with the astronomical seasons. In each cycle of 400 years there are 146097 days altogether, giving an average year-length of 365.2425 days, which is close enough for most purposes but is corrected occasionally by extra leap seconds when needed. The earth rotates around the sun for 365 days and 6 hours our convenience count only 365 Day's after every 4 Years 24 hours get completed we add the time an as additional day in February which is of 29 days. thus every fourth year is known as leap year. (MORE)

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In Leap Year

Leap Years in the Gregorian calendar (named for Pope Gregory, who made it official) occur every 4 years, in year numbers that are evenly divisible by 4. So 2004, 2008, 2012, 2…016 are all leap years. There are two exceptions. 1. For "century" years, those that are divisible by 100, these are NOT leap years. So 1900 was not a leap year, and 2100 will not be. Remember that; many of you will live to see this. Your children very probably will. 2. For century years that are divisible by 400, these ARE leap years even though point #1 says that they would not be. So 2000 was a leap year, and the year 2400 will be even though none of us will be around to see it. Every year that is a multiple of 4 will most probably be a leap year (MORE)

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In Leap Year

A year that has 366 days rather than 365 is called a leap year. A year divisible by 4 (but not by 100) is a leap year. Years divisible by 500 are leap years.

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20c + 5 = 5c + 65 Divide through by 5: 4c + 1 = c + 13 Subtract c from both sides: 3c + 1 = 13 Subtract 1 from both sides: 3c = 12 Divide both sides by 3: c = 4 20c + 5 = 5c …+65 20c - 5c= 65 - 5.
15c = 60.
15c/15 = 60/15.
c = 4 (alternative method). (MORE)

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In Calendar

Every leap year has at least 52 Wednesdays. The last leap year that started on a Wednesday was 1992. The last time February 29 fell on a Wednesday was 1984. The last leap year… that ended on a Wednesday was 2008. (MORE)

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In Leap Year

The first leap year in the modern sense was 1752, when 11 days were 'lost' from the month September with the adoption of the Gregorian calendar by Britain and her colonies. Af…ter 1752 we adopted the system still in use today where an additional day is inserted in February in years wholly divisible by 4, other than years ending in 00 with the exception of those divisible by 400 which are still leap years (like 2000). This is certainly not the first use of leap years, the Julian calendar we used before 1752 had a simpler system of leap years, and remember, no calendar is universal. (MORE)