Bpdating com
We need a fixed point in time as a starting point so that all the BP dates are equivalent no matter when they are published.Since the BP designation was originally associated with radiocarbon dating, archaeologists chose the year 1950 as a reference point for 'the present.' That date was chosen because radiocarbon dating was invented in the late 1940s.
If it was a simple matter of counting backward, what was accurately measured and published as 500 BP today in fifty years would be 550 BP.
So, when you see 2000 cal BP, think "2000 years before the calendar year 1950" or what calculates to the calendar year 50 BCE.
No matter when that date is published, it will always mean that.
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It has to do with the advent of carbon dating techniques.
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