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  1. The 1st century BC, also known as the last century BC, started on the first day of 100 BC and ended on the last day of 1 BC.The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1".

  2. en.wikipedia.org › wiki › 20_BC20 BC - Wikipedia

    Millennium: : 1st millennium BC Centuries: : 2nd century BC 1st century BC 1st century; Decades: : 40s BC 30s BC 20s BC 10s BC 0s BC Years: : 23 BC 22 BC 21 BC 20 BC 19 BC 18 BC

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