POLE SHIFT OBSERVER // EARTH ORIENTATION PARAMETERS

IERS BULLETIN A × ESMGFZ AAM  |  POLAR MOTION & ROTATION  |  AUTO-REFRESH 24H  | 
POLAR MOTION
TIME SERIES
COMPARE
AAM INTRADAY

Polar Motion of the Rotation Pole

Path of the Earth's instantaneous rotation pole (x_pole vs y_pole, arcseconds). Showing the most recent 10 years; the last 3 years are highlighted in red. The Chandler + annual wobble traces the characteristic spiral.
Last 3 years Years 4–10 Prediction Current pole

EOP Time Series

Individual Earth orientation parameters over the 10-year window. Last 3 years highlighted; dashed amber marks Bulletin A predictions; the vertical cyan line is "now".

Compare by Day & Time

Pick two epochs to compare full EOP state. AAM excitation resolves to 3-hour granularity, so choose a time of day to compare sub-daily atmospheric forcing.

▲ EPOCH A

▲ EPOCH B

AAM Intraday Excitation

ESMGFZ Atmospheric Angular Momentum effective excitation functions (dimensionless) at 3-hour resolution for a single day — mass terms (pressure) and motion terms (winds), X / Y / Z components.