Era of Nabonassar
About the Era of Nabonassar
Ptolemy dated ancient observations from the first regnal year of the Babylonian king Nabonassar, beginning 26 February 747 BCE in the Julian calendar. Because Babylonian records were continuous, the era let him organize eclipse and planetary data across centuries in the Almagest. It remains the backbone of ancient astronomical chronology, since everything Ptolemy cites hangs on it.
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