Before Present BP years is a time scale used mainly in archaeologygeology and other scientific disciplines to specify when events occurred in the past. Because the "present" time changes, standard practice is to use 1 January as the commencement date epoch of the age scale, [a] reflecting the origin of practical radiocarbon dating in the s. The abbreviation "BP" has been interpreted retrospectively as "Before Physics";  that refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, making dating after that time likely to be unreliable.
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