Common Era
Common Era (also Current Eraor Christian Era),abbreviated as CE, is an alternative naming of the calendar era, Anno Domini ("in the year of the/our Lord", abbreviated AD).BCE is the abbreviation for B...
Anno Domini
Anno Domini (AD or A.D.) and Before Christ (BC or B.C.) are designations used to label or number years used with the Julian and Gregorian calendars. The term Anno Domini is Medieval Latin, translated ...
Millennium
A millennium (plural millennia) is a period of time equal to 1000 years. It derives from the Latin mille, thousand, and annus, year. It is often, but not necessarily, related to a particular dating sy...
Millennium - Wikipedia
Astronomical year numbering
Astronomical year numbering is based on AD/CE year numbering, but follows normal decimal integer numbering more strictly. Thus, it has a year 0, the years before that are designated with negative numb...
0 (year)
Year zero does not exist in the Anno Domini/Common Era system usually used to number years in the Gregorian calendar and in its predecessor, the Julian calendar. In this system, the year 1 BC is follo...
Calendar era
A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era (the Coptic and Ethiopic churches have their own Chri...