Both of these early Christian writers, following the Septuagint version of the Old Testament, determined the age of the world to have been about 5,530 years at the birth of Christ. Dr.Ben Zion Wacholder points out that the writings of the Church Fathers on this subject are of vital significance (even though he disagrees with their chronological system based on the authenticity of the Septuagint, as compared to that of the Hebrew text), in that through the Christian chronographers a window to the earlier Hellenistic Biblical chronographers is preserved: An immense intellectual effort was expended during the Hellenistic period by both Jews and pagans to date Creation, the flood, the exodus, the building of the Temple...It is not known who invented this era and when, however it appears for the first time in the treatise of a certain “monkand priest”, Georgios (AD 638-39), who mentions all the main variants of the "World Era" (Ére Mondiale) in his work. Georgios makes it clear that the main advantage of the Byzantine era is the common starting point of the astronomical lunar and solar cycles, and of the cycle of indictions, the usual dating system in Byzantium since the sixth century.He also already regards it as the most convenient for the Easter computus.Maximus the Confessor, considering the implications of the theory of evolution in light of the seventh century saint's system."St. Theophanes the Confessor, as well as chroniclers such as George Syncellus.Its striking mysticism made it popular in Byzantium especially in monastic circles.After the collapse of the Byzantine Empire in 1453, the era continued to be used by Russia, which witnessed millennialist movements in Moscow in AD 1492 (7000 AM) due to the end of the Church calendar.
Alexandrian Era The "Alexandrian Era" (Greek: Κόσμου ἔτη κατ’ Ἀλεξανδρεῖς ) developed in AD 412, was the precursor to the Byzantine Era.Complex calculations of the nineteen-year lunar and twenty-eight-year solar cycles within this world era allowed scholars to discover the cosmic significance of certain historical dates, such as the birth of Christ or the Crucifixion. This date underwent minor revisions before being finalized in the mid-seventh century A.D., although its precursors were developed circa AD 412.All these events happened, according to the Alexandrian chronology, on the 25th of March; furthermore, the first two events were separated by the period of exactly 5500 years; the first and the third one occurred on Sunday—the sacred day of the beginning of the Creation and its renovation through Christ. St.
Dionysius of Alexandria had earlier emphatically quoted mystical justifications for the choice of March 25 as the start of the year: March 25 was considered to be the anniversary of Creation itself.
September AD 2000 began the year 7509 AM. Earliest Christian Sources on the Age of the World The earliest extant Christian writings on the age of the world according to the Biblical chronology are by St.