TT(BIPM) is a realization of Terrestrial Time as defined by the International Astronomical Union (IAU). It is computed annually by the BIPM, based on a weighted average of the evaluations of the frequency of TAI by the primary and secondary frequency standards. It is mostly used in scientific applications requiring long-term frequency stability and high frequency accuracy.
Last computed TT(BIPMXY) and older computations can be accessed below :
(Each computation is identified by the string XY where 19XY or 20XY is the last year of data included)