11/6/2023 0 Comments February 2022 mini calendar![]() The length of a day is also occasionally corrected by inserting a leap second into Coordinated Universal Time (UTC) because of variations in Earth's rotation period. For example, Christmas Day (25 December) fell on a Sunday in 2016, Monday in 2017, Tuesday in 2018, and Wednesday in 2019, but then leapt over Thursday to fall on a Friday in 2020. The term leap year probably comes from the fact that a fixed date in the Gregorian calendar normally advances one day of the week from one year to the next, but the day of the week in the 12 months following the leap day (from 1 March through 28 February of the following year) will advance two days due to the extra day, thus leaping over one day in the week. In the Solar Hijri and Bahá'í calendars, a leap day is added when needed to ensure that the following year begins on the March equinox. In the lunisolar Hebrew calendar, Adar Aleph, a 13th lunar month, is added seven times every 19 years to the twelve lunar months in its common years to keep its calendar year from drifting through the seasons. This extra leap day occurs in each year that is an integer multiple of 4 (except for years evenly divisible by 100, but not by 400). Again each leap year has 366 days instead of 365. ![]() The Gregorian calendar, the world's most widely used civil calendar, makes a further adjustment for the small error in the Julian algorithm. The historic Julian calendar has three common years of 365 days followed by a leap year of 366 days, by extending February to 29 days rather than the common 28. By inserting (" intercalating") an additional day (a " leap day") or month into some years, the drift between a civilization's dating system and the physical properties of the Solar System can be corrected.Īn astronomical year lasts slightly less than 365 1 / 4 days. Because astronomical events and seasons do not repeat in a whole number of days, calendars that have a constant number of days in each year will unavoidably drift over time with respect to the event that the year is supposed to track, such as seasons. JSTOR ( February 2020) ( Learn how and when to remove this template message)Ī leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added to keep the calendar year synchronized with the astronomical year or seasonal year.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. ![]() This article needs additional citations for verification.
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