A leap year is a calendar year containing one additional day added to keep the calendar year By this rule, the average number of days per year is + 1⁄4 − 1⁄ + 1⁄ = The rule can be applied to February 29 is a date that usually occurs every four years, and is called leap day. This day is added to. Even if the world does end in , the Maya calendar deserves no credit for The biggest period endings they experience are Bak'tun endings. 6 at the Tortuguero archaeological site in Mexico's Tabasco state. agreed that the reference to a specific date is clear in Monument 6, years of history. Leap years are needed to keep our modern day Gregorian calendar in After only years, our calendar would be off by around 24 days!.
A Swedish pocket calendar from showing February 29 February calendar showing that was not a leap year February 29 is a date that usually occurs every four years, and is called leap day. This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit the sun in precisely days.
The Gregorian calendar is a modification of the Julian calendar first used by the Romans. The Roman calendar originated as a lunisolar calendar and named many of its days after the syzygies of the moon: The Nonae or nones was not the first quarter moon but was exactly one nundina or Roman market week of nine days before the ides, inclusively counting the ides as the first of those nine days. This is what we would call a period of eight days.
InIdeler believed that the lunisolar calendar was abandoned about BC by the decemvirswho implemented the Roman Republican calendarused until 46 BC. The days of these calendars were counted down inclusively to the next named day, so February 24 was ante diem sextum Kalendas Martias "the sixth day before the calends of March" often abbreviated a.
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The Romans counted days inclusively in their calendars, so this was actually the fifth day before March 1 when counted in the modern exclusive manner not including the starting day.
The remaining days of Februarius were dropped. This intercalary month, named Intercalaris or Mercedoniuscontained 27 days. The religious festivals that were normally celebrated in the last five days of February were moved to the last five days of Intercalaris. Because only 22 or 23 days were effectively added, not a full lunation, the calends and ides of the Roman Republican calendar were no longer associated with the new moon and full moon.
The Julian calendar, which was developed in 46 BC by Julius Caesarand became effective in 45 BC, distributed an extra ten days among the months of the Roman Republican calendar. Caesar also replaced the intercalary month by a single intercalary day, located where the intercalary month used to be.
To create the intercalary day, the existing ante diem sextum Kalendas Martias February 24 was doubled, producing ante diem bis sextum Kalendas Martias. Hence, the year containing the doubled day was a bissextile bis sextum, "twice sixth" year. For legal purposes, the two days of the bis sextum were considered to be a single day, with the second half being intercalated; but in common practice bywhen Censorinus wrote, the intercalary day was followed by the last five days of February, a.
Thus the intercalated day was effectively inserted between the 23rd and 24th days of February. All later writers, including Macrobius aboutBede inand other medieval computists calculators of Eastercontinued to state that the bissextum bissextile day occurred before the last five days of February.
In the older Roman Missalfeast days falling on or after February 24 are celebrated one day later in leap year.
Matthias shifting from February 23 to the leap day of February Other feasts normally falling on February 25—28 in common years are also shifted to the following day in a leap year although they would be on the same day according to the Roman notation. The practice is still observed by those who use the older calendars. Synchronized calendars Bengali, Indian and Thai [ edit ] The Revised Bengali Calendar of Bangladesh and the Indian National Calendar organise their leap years so that the every leap day is close to a February 29 in the Gregorian calendar and vice versa.
This makes it easy to convert dates to or from Gregorian. Julian, Coptic and Ethiopian calendars[ edit ] From AD 8 the Julian calendar received an extra day added to February in years that are multiples of 4.
The Coptic calendar and Ethiopian calendar also add an extra day to the end of the year once every four years before a Julian day February. This rule gives an average year length of However, it is 11 minutes longer than a tropical year.
This means that the vernal equinox moves a day earlier in the calendar about every years. Revised Julian calendar[ edit ] The Revised Julian calendar adds an extra day to February in years that are multiples of four, except for years that are multiples of that do not leave a remainder of or when divided by This rule agrees with the rule for the Gregorian calendar until The first year that dates in the Revised Julian calendar will not agree with those in the Gregorian calendar will bebecause it will be a leap year in the Gregorian calendar but not in the Revised Julian calendar.
This is a very good approximation to the mean tropical year, but because the vernal equinox year is slightly longer, the Revised Julian calendar for the time being does not do as good a job as the Gregorian calendar at keeping the vernal equinox on or close to March Chinese calendar[ edit ] The Chinese calendar is lunisolarso a leap year has an extra month, often called an embolismic month after the Greek word for it.
In the Chinese calendar the leap month is added according to a rule which ensures that month 11 is always the month that contains the northern winter solstice. Hebrew calendar[ edit ] The Hebrew calendar is lunisolar with an embolismic month.
According to the Metonic cyclethis is done seven times every nineteen years specifically, in years 3, 6, 8, 11, 14, 17, and This is to ensure that Passover Pesah is always in the spring as required by the Torah Pentateuch in many verses  relating to Passover.
In addition, the Hebrew calendar has postponement rules that postpone the start of the year by one or two days. Using Livestream, anyone anywhere in the world can broadcast events as they happen, plus add photos, text, and video using web browsers and mobile devices.
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