IERS Rapid Service / Prediction Center

IERS Bulletins

IERS Bulletin B ("Final" Earth Orientation Paramter Values)

IERS Bulletin C (Leap Second Announcement)

  • Information about leap second announcements
  • Table of leap seconds since 1961; differences between International Atomic Time (TAI) and Coordinated Universal Time (UTC)

IERS Bulletin D (Announcements of DUT1)

  • Values of DUT1 = (UT1-UTC) transmitted with time signals are published in IERS Bulletin D to a precision of 0.1 s
  • Archived issues of Bulletin D