BC is before Christ, AD is anno domini (year of our lord). There were many different calendar systems over time but given the dominance and global reach of the west the Gregorian Calendar is the standard. It’s much easier to navigate and trade if everyone has a standard system, which is also why the prime meridian is in Greenwich England, because at the time the British were the rulers of the seas. Now many scholars use BCE and CE as before common era, but IMO that’s dumb because we’re still counting from Jesus we’re just pretending we’re not.
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