IERS Bulletin B provides current information on the Earth's orientation in the IERS Reference System. This includes Universal Time, coordinates of the terrestrial pole, and celestial pole offsets.
IERS Bulletin B consists of 5 sections:
Daily final values at 0:00 UT of x, y, UT1-UTC, dX, dY, and their uncertainties. Time span: one month with final values, one month with preliminary values.
Daily final values at 0:00 UT of celestial pole offsets dPsi and dEps in the IAU 1980 system and their uncertainties.
Earth angular velocity (daily estimates of LOD and OMEGA with their uncertainties).
Information on the time scales and announcement of occurring leap seconds.
Average formal precision of the individual and combined series contributing or not to the combination and their agreement with the combination.