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The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture . Archeologists have reconstructed methods of timekeeping that go back to ...
A week is a unit of time equal to seven days. It is the standard time period used for short cycles of days in most parts of the world. The days are often used to indicate common work days and rest days, as well as days of worship. Weeks are often mapped against yearly calendars, but are typically not the basis for them, as weeks are not based ...
The Iranian calendars or Iranian chronology ( Persian: گاهشماری ایرانی, Gâh-Şomâriye Irâni) are a succession of calendars created and used for over two millennia in Iran, also known as Persia. One of the longest chronological records in human history, the Iranian calendar has been modified many times for administrative ...
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. The most widely observed purely lunar calendar is the Islamic calendar. [a] A purely lunar calendar is distinguished from a lunisolar calendar, whose ...
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
This page was last edited on 1 January 2022, at 23:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may ...
A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of three general variations: Fourteen one-year calendars, plus a table to show which one-year calendar is to be ...
The early Germanic calendars were the regional calendars used among the early Germanic peoples before they adopted the Julian calendar in the Early Middle Ages. The calendars were an element of early Germanic culture . The Germanic peoples had names for the months that varied by region and dialect, but they were later replaced with local ...