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Terrestrial Time
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=== TT(BIPM) === Approximately annually since 1992, the International Bureau of Weights and Measures ([[BIPM]]) has produced better realizations of TT based on reanalysis of historical TAI data. BIPM's realizations of TT are named in the form "TT(BIPM08)", with the digits indicating the year of publication. They are published in the form of a table of differences from TT(TAI), along with an extrapolation equation that may be used for dates later than the table. The latest {{As of|2024|7|lc=on}} is TT(BIPM23).<ref>{{cite web |title=Index of /ftp/pub/tai/ttbipm |url=https://webtai.bipm.org/ftp/pub/tai/ttbipm/ |website=webtai.bipm.org |access-date=8 July 2024}}</ref>
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