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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.
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.Long after the Gregorian calendar was established throughout most of the world, atomic clocks have allowed us to adjust our modern calendars with leap seconds to correct for the slowing spin of our planet and other corrections.But, perhaps the most interesting outcome of all this investigation is the wide variety of modern mathematicians and programmers who have taken a crack at perfecting the matches between ancient calendars using modern technology.In other words, we can say that in relative dating the archaeologist determines that which of the two fossil or the artifacts are older.Contrary to this, absolute dating is the technique, using which the exact age of the artifacts, fossils, or sites are ascertained.
Nonetheless, 1950 is a long time ago now—should we adjust the starting point to 2000?