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A lunar calendar is a calendar based on the monthly cycles of the Moon 's phases ( synodic months, lunations ), in contrast to solar calendars, whose annual cycles are based on the solar year.
This article is about a calendar used for civil and liturgical purposes. For the day-number calendar used for astronomical and historical calculations, see Julian day. For day of year, see Ordinal date. For the terms 'Julian date' and 'Julian Period', see Julian day.
Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923.
The Aztec sun stone, also called the calendar stone, is on display at the National Museum of Anthropology in Mexico City . The calendar consists of a 365-day calendar cycle called xiuhpōhualli (year count), and a 260-day ritual cycle called tōnalpōhualli (day count). These two cycles together form a 52-year "century", sometimes called the "calendar round". The xiuhpōhualli is considered to ...
The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science . In this visualization, the Big Bang took place at the beginning of January 1 at midnight, and the ...
Legendary 10-month calendar[edit] The Romans themselves usually described their first organized year as one with ten fixed months, [17] [18] a decimal division fitting general Roman practice. [19] There were four months of "31" days [17] —March, May, Quintilis, and October—called "full months" ( pleni menses) and six months of "30" days [17 ...
The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [1] [2] drawing inspiration from Lewis Carroll 's perpetual calendar algorithm. [3] [4] [5] It ...
The Anno Domini era is based on the erroneous or contentious estimates of the birth year of Jesus of Nazareth. The era places Jesus's birth year in AD 1, but modern scholars have determined that it is more likely that he was born in or before 4 BC. [4] Emiliani argued that replacing the contested date with the approximate beginning of the Holocene makes more sense.
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