Last leap second: 31 December 2016
  TAI - UTC: 37 s
      Next leap second: Not scheduled

Leap second file                     Leap second web service

Latest C04 values for pole coordinates (x,y) and UT1 on 19 April 2024 at 0h UTC:

x= -2.36 mas   y= 379.24mas   UT1-UTC= -16.777 ms

For the latest 7-20 days and the prediction
IERS recommends the use of Bulletin A
provided by the IERS Rapid Service (USNO, Washington)

Missions of the EOP Product Centre of the International Earth Rotation and Reference Systems Service (IERS):
  • Collect through the world the time series of the Earth Orientation Parameters (EOP):
    • pole coordinates (x,y)
    • universal time (UT1-UTC, UT1-TAI) or length-of-day offset LOD
    • Celestial pole offsets (Dpsi, Deps)

    These time series are derived from the various astro-geodetic techniques (LLR, SLR, GPS, VLBI and DORIS).

  • Archive EOP and make them avaible through FTP/WEB

  • Analyse EOP and in particular monitor their consistencies with respect to the international terrestrial and celestial referene frames.

  • Compute combined standard solution for EOP: Bulletin B or IERS C04 solution (daily since 1962), and IERS C01 solution (0.05 year sampling since 1846)

  • Compute and make available DUT1 (Bulletin D) and leap second announcements (Bulletin C).

Applications
  • astrometry
  • geophysics
  • space geodesy
  • orbit determination
  • timing
  • positioning

For users interested in the rapid and predicted EOP, refer to Bulletin A provided by the IERS Rapid Service/Prediction Center located at USNO.

Staff

Dr. Christian Bizouard
   Astronomer
    Director of the EOP PC

Olivier Becker
    Technician
    WEB master, C04 solution,
    operational service

Jean-Yves Richard
    Engineer
    Multitechnique Combination
    "GINS Dynamo"

Dr. Daniel Gambis
    Astronomer, scientific adviser,
    retired

Dr. Sébastien Lambert
    Astronomer
    Numerical analysis

Teddy Carlucci
    Engineer
    Computer manager

Pascale Baudoin
    Secretary
    Administration of EOP-PC


Our graphics or plots are designed thanks to php package JPGRAPH
Contact
Director
Dr. Christian Bizouard
IERS EOP PC
Observatoire de Paris
61, avenue de l'Observatoire
75014 Paris/ FRANCE
Tel
00 33 (0)1 40 51 23 35