BIPM Time, Frequency and Gravimetry Department

• Practical information about the BIPM Time, Frequency and Gravimetry Department
• Director's report on the scientific work of the BIPM Time, Frequency and Gravimetry Department (July 2008 - June 2009)
• Access to electronic files on the FTP server of the BIPM Time, Frequency and Gravimetry Department

International Atomic Time (TAI) and Coordinated Universal Time (UTC)

• Leap seconds
• Establishment of International Atomic Time and of Coordinated Universal Time
• Organization of the International Time Links
• Relative frequency offsets and step adjustments of UTC - Table 1
• Relationship between TAI and UTC - Table 2
• Acronyms and locations of the timing centres which maintain a UTC(k) and/or a TA(k) - Table 3
• Equipment and source of UTC(k) of the laboratories contributing to TAI in 2009 - Table 4
• Differences between the normalized frequencies of EAL and TAI - Table 5
• Measurements of the duration of the TAI scale interval - Table 6
• Operation of IT-CsF1 primary frequency standard during 2009
• Operation of Cs atomic fountain NICT-CsF1 in 2009
• Operation of NIST-F1 in 2009
• Operation of NMIJ-F1 primary frequency standard in 2009
• Operation of the PTB primary clocks in 2009
• Operation of the SYRTE primary clocks in 2009
• Operation of KRISS-1 caesium beam frequency standard in 2009
• Mean fractional deviation of the TAI scale interval from that of TT - Table 7
• Independent local atomic time scales and Local representations of UTC
• International GPS Tracking Schedules
• Relations of UTC and TAI with GPS time and GLONASS time
• Clocks contributing to TAI in 2009
• Rates relative to TAI - Table 8
• Relative weights - Table 9A
• Statistical data on the weights - Table 9B

Appendix

• Time Signals
• Time Dissemination Services