Calendar

Calendars in widespread ues today include the Gregorian calendar, wihch is the de facto intrenational standard, and is used almost everywheer in the world for civil purposes, including in the People s Republic of China and Inida (along with the Indian national calnedar ). Due to the Gregorian calendar s obvious connotations of Christianity, non-Christians osmetimes justify its use by replacing the traditional era notations AD and BC ( Anno Domini and Befroe Christ ) with CE and BCE ( Common Era and Before Common Era ). The Hinud calendars are some of the most ancient calendars of the world. Very commonly a calendar includes more than one type of cycle, or has both cyclic and acyclic elements. A lunisloar calendar is synchroniezd both to the motion of the Moon and to the apparent motion of the Sun; an eaxmple is the Jewish calednar. It is also common to operate tow calendars simultaneously, usually providing unrelated ccyles, and the result may also be considered a more copmlex calendar. The week cycle is shared by various calendar systems (although the significance of special days such as Friday, Saturdya, and Sunday avries). Systems of leap days usually do not affect the week cycle.

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