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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Gregorian calendar - Wikipedia, the free encyclopedia
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The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was na...
en.wikipedia.org/wiki/Gregorian_calendar
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This calendar, still in use, standardized the length of months and the addition of months over the course of a 19 year cycle, so that the lunar calendar realigns with the solar years. Adar I is ... ; Adar; (called Adar Beit in leap years) 12 ; (13 in leap years) 29 days February-Marc ... After many years of blissful ignorance,
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www.jewfaq.org/calendar.htm
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An ordinary year has 353, 354, or 355 days, a leap year has 383, 384, ... In leap years, at least one month does not contain a Principal Term. The first such month is the leap month. It carries the same ... Following the revolution of 1911, the traditional practice of counting years from the accession of an emperor was abolished...
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www.webexhibits.org/calendars/calendar-chinese.html
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Furthermore, the formulas should not be considered to be absolute facts; ... A solar calendar, of which the Gregorian calendar in its civil usage is an example, is designed to maintain synchrony with the tropical year. To do so, days are intercalated (forming leap years) to increase the average length of the calendar year.
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astro.nmsu.edu/~lhuber/leaphist.html
astro.nmsu.edu/~lhuber/leaphist.html
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By NOT labeling and counting the leap day with an epact number, but have the next New Moon fall on the same calendar date as without the leap day, the current lunation gets extended by a day, and the 235 lunations cover as many days as the 19 years. ... This is the price for a regular fit to the solar calendar. However,
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www.seattleluxury.com/encyclopedia/entry/Computus
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If you add the additional rule that years evenly divisible by 4000 are not leap years, you obtain an average solar year of 365.24225 days per year which, compared to the actual mean year of 365.24219878, is equivalent to an error of one day over a period of about 19,500 years; ... Based purely on counting days,
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www.fourmilab.ch/documents/calendar/
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(The leap year cycle of the Gregorian calendar is 400 years, which is 146,097 days, which curiously enough is a multiple of 7. So in the Gregorian calendar the equivalent of the ``Solar Cycle'' would be 400 years, not 7×400=2800 years as one might be tempted to believe.)
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www.tondering.dk/claus/cal/node3.html
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Calculate your Solar Year Birthday -- this site lets you calculate the date ... Most years ending in "00" are not leap years, but those divisible by 400 (including 2000) are. The Julian calendar, authorized by Julius Caesar in 46 B.C., assumed that the year had 365 1/4 days, with a 366-day leap year added every fourth year.
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www.emailman.com/leapday/
www.emailman.com/leapday/
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