当前时间：
中国科学院数据云门户当前时间：
中国科学院数据云门户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:
Section 1:
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.
Section 2:
Daily final values at 0:00 UT of celestial pole offsets dPsi and dEps in the IAU 1980 system and their uncertainties.
Section 3:
Earth angular velocity (daily estimates of LOD and OMEGA with their uncertainties).
Section 4:
Information on the time scales and announcement of occurring leap seconds.
Section 5:
Average formal precision of the individual and combined series contributing or not to the combination and their agreement with the combination.