In the Bahá'í Calendar, 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. The leap year of 366 days has 52 weeks and two days, hence the year following a leap year will start later by two days of the week. These extra days occur in each year which is an integer multiple of 4 (except for years evenly divisible by 100, but not by 400). A year that is not a leap year is a common year.įor example, in the Gregorian calendar, each leap year has 366 days instead of 365, by extending February to 29 days rather than the common 28. By inserting (called intercalating in technical terminology) an additional 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. 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.

Chicago telugu calendar 2020 may