Leap year - Wikipedia, the free encyclopedia
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A leap year (or intercalary year ) is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronized with the ast...
en.wikipedia.org/wiki/Leap_year
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Why is a Leap Year Necessary? ... 2012 is a leap year, which means that it has 366 days instead of the usual 365 days that an ordinary year has. An extra day is added in a leap year—February 29 —which is called an intercalary day or a leap day. ... Rules for Determining a Leap Year...
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www.infoplease.com/spot/leapyear2.html
www.infoplease.com/spot/leapyear2.html
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A leap year occurs every four years to help synchronize the calendar year with the solar year, or the length of time it takes the earth to complete its orbit about the sun, which is about 365¼ days.
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www.infoplease.com/askeds/leap-year-rules.html
www.infoplease.com/askeds/leap-year-rules.html
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To make a calendar a better measure of the Earth's orbit around the Sun, leap year rules were created and have since been modified. These improvements have brought a close correlation between the calendar and the orbit, but the calendar year will always be an approximation.
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www.wwu.edu/depts/skywise/leapyear.html
www.wwu.edu/depts/skywise/leapyear.html
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That makes the average calendar year 365.2425 days, compared with the correct value 365.2422. The rule chosen was that if the last two digits of the year are both zero (1900, 2000, 2100 ...) then it is only a leap year if the first two digits are divisible by 4. Thus 1600, 2000 are leap years, but 1700, 1800,
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www.cryst.bbk.ac.uk/CCSG/resources/Year2000/Leap_year_3...
www.cryst.bbk.ac.uk/CCSG/resources/Year2000/Leap_year_30Feb.html
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@ February 29 LEAP Year - LEAP Day © 1995-2008 Leap Day (February 29th); @ February 29 LEAP Year - LEAP Day; (an extra day / 24 hours / 1440 minutes / 86,400 seconds) Why???; ... Rules of courtship are less stricter now than years ago when women who were hoping to marry their beaus had to wait for a proposal;
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www.mystro.com/leap.htm
www.mystro.com/leap.htm
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Eventually new leap year rules will have to be introduced. However, we don’t need to worry about tinkering with Pope Gregory’s leap year rules any time soon. ... Vernal equinoxes are used to calculate leap years. Pope Gregory first recognised seasonal drift and devised leap year rules and the Gregorian Calender.
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www.allsands.com/History/leapyear_zxz_gn.htm
www.allsands.com/History/leapyear_zxz_gn.htm
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In the Gregorian calendar, Century years which are leap years occur every four hundred years, not every thousand years. Q: But what about the 3200-year rule ...
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www.dpbsmith.com/leapyearfaq.txt
www.dpbsmith.com/leapyearfaq.txt
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As you can see from the date, this is February 29, a ... This led to the adoption of the Gregorian calendar in 1582 (some countries did not make the switch until 1712 or 1752), which introduced a slight twist to the usual leap year rules.
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www.karlonia.com/2008/02/29/leap-year-rules-facts-trivi...
www.karlonia.com/2008/02/29/leap-year-rules-facts-trivia/
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