BIPM Annual Report on Time Activities 2020:
International Atomic Time (TAI) and Coordinated Universal Time (UTC)
Leap seconds [IERS Bulletin C]
Establishment of International Atomic Time and of Coordinated Universal Time
Geographical distribution of the laboratories that contribute to TAI and time transfer equipment
Table 1: Relative frequency offsets and step adjustments of UTC
Table 2: Relationship between TAI and UTC
Table 3: Acronyms and locations of the timing centres that maintain a UTC(k) and/or TA(k)
Table 4: Equipment and source of UTC(k) of the laboratories contributing to TAI in 2020
Table 5: Differences between the normalized frequencies of EAL and TAI
Table 6: Measurements of the duration of the TAI scale interval
- Operation of METAS-FOC2 in 2020
- Operation of IT-CsF2 in 2020
- Operation of NICT-Sr1 in 2020
- Operation of NIM5 in 2020
- Operation of NMIJ-Yb1 in 2020
- Operation of NPL-CsF2 in 2020
- Operation of NRC-FCs2 in 2020
- Operation of SYRTE PSFS in 2020
- Operation of PTB primary clocks in 2020
Table 7: Mean fractional deviation of the TAI scale interval from that of TT
Independent local atomic time scales and Local representations of UTC
Relations of UTC and TAI with GPS time and GLONASS time
Clocks contributing to TAI in 2020
Table 8: Statistical data on the weights attributed to the clocks in 2020