events
According to Ptolemy, the epoch (origin) of the Nabonassar Era began at noon on this date. Historians use this to establish the modern BC chronology for dating historic events.
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Ptolemy
Astronomer and geographer (c. 100–170)
Claudius Ptolemy, better known mononymously as Ptolemy, was a Greco-Roman mathematician, astronomer, astrologer, geographer, and music theorist who wrote about a dozen scientific treatises, three of which were important to later Byzantine, Islamic, and Western European science.…Source: Wikipedia (CC BY-SA)
Epoch
Reference point from which time is measured
In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.Source: Wikipedia (CC BY-SA)
Nabonassar
8th-century BC king of Babylon
Nabû-nāṣir was the king of Babylon from 747 to 734 BC. He deposed a foreign Chaldean usurper named Nabu-shuma-ishkun, bringing native rule back to Babylon after twenty-three years of Chaldean rule. His reign saw the beginning of a new era characterized by the systematic…Source: Wikipedia (CC BY-SA)
February 26
Day of the year
February 26 is the 57th day of the year in the Gregorian calendar; 308 days remain until the end of the year.Source: Wikipedia (CC BY-SA)
Anno Domini
Modern calendar era
The terms Anno Domini (AD) and before Christ (BC) are used when designating years in the Gregorian and Julian calendars. The term anno Domini is Medieval Latin and means "in the year of the Lord" but is often presented using "our Lord" instead of "the Lord", taken from the full…Source: Wikipedia (CC BY-SA)