BC, or time before the birth of Christ, and AD, Anno Domini are ways of counting years and designating times before or after a widely recognized point in time. There is no practical limit on the number of years before the birth of Christ. The years go back to the unknown start of time. In years AD, 2016 of them so far.
about 4,500,000,000
470 years.
2451 years
49 years
2451 years.
545 years.
208 years
918 years
2451 years
2450 years
90 years.
1900 years.
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