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In astronomy, geology, and paleontology, 'tya', sometimes also 'kya', is an acronym for 'thousand years ago' and is used as a unit of time to denote length of time before the present. The once popular term 'kya' is replaced in modern scientific literature with the SI unit ka (kiloannum).

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See also

See also

★ annum

★ Before Present

★ Gya

★ bya

★ mya (unit)