Geochronology is the science of determining the age of rocks, fossils, and sediments using signatures inherent in the rocks themselves. Absolute geochronology...

Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most...

English, is Ante Christum natum (ACN) or Ante Christum (AC). This calendar era is based on the traditionally reckoned year of the conception or birth of...

up era in Wiktionary, the free dictionary. An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in...

The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant...

Japanese era name (Japanese: 年号, Hepburn: nengō, "year name") or gengō (元号), is the first of the two elements that identify years in the Japanese era calendar...

ɑːrˈkiːən/ NEE-oh-ar-KEE-ən; also spelled Neoarchaean) is the last geologic era in the Archean Eon that spans from 2800 to 2500 million years ago—the period...

most commonly used, other minerals such as monazite (see: monazite geochronology), titanite, and baddeleyite can also be used. Where crystals such as...

geologic era within the Archean Eon. The name derives from Greek "Palaios" ancient. It spans the period of time 3,600 to 3,200 million years ago. The era is...

A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. For example, it is the year 2024 as...