Astronomical dating system

The western-style year dating convention commonly used in many parts of the world was created by the monk Dionysius Exiguus in or about the year AD 532.

The convention is based on Exiguus' determination of the year in which Jesus Christ was born.

The first indiction cycle began on 1 September 327.

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3) The indiction cycle: a Roman tax cycle of 15 years declared by Constantine the Great.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 numbers and the years after that are designated with positive numbers.The instant, date, or year from which time is marked is called the epoch of the era.There are many different calendar eras such as Saka Era.

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