Christian dating numbers
This involved naming both consules ordinarii who had taken up this office on January 1 (since 153 BC) of the relevant civil year.
Astronomers have identified this eclipse as one that took place on 15 June, 763 BC, which has allowed absolute dates of 892 to 648 BC to be assigned to that sequence of eponyms.
Soon afterwards, imperial regnal dating was adopted in its place.
Another method of dating, rarely used, was anno urbis conditae (Latin: "in the year of the founded city" (abbreviated AUC), where "city" meant Rome).
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.