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Before Present

3:29

BC | AD | BCE | BC | BP

3:55

BP and circa in history explained

3:55

Before Present - The Catafalque.

1:57

SSENSE x Off-White present BEFORE and AFTER

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Present Perfect (Already, Yet, Ever, Before)

Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events occurred in the past. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date of the age scale, reflecting the origin of practical radiocarbon dating in the 1950s. The abbreviation "BP" has alternatively been interpreted as "Before Physics"; that is, 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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