IERS Rapid Service / Prediction Center

IERS Bulletin A Plots

Polar Motion

Missing Polar Motion Figure
Polar motion over time, where time increases along the z-axis in the positive direction. The plot on the left shows polar motion since 1973, while the plot on the right shows polar motion for the last 5 years.
Missing PM-x Figure
Polar Motion (PM) x over time. The top plot shows variations in PM-x since 1973, while the bottom plot shows PM-x variations for the last 5 years.
Missing PM-y Figure
Polar Motion (PM) y over time. The top plot shows variations in PM-y since 1973, while the bottom plot shows PM-y variations for the last 5 years.

Length of Day (LOD)

Missing LOD Figure
Length of Day (LOD) over time, with solid-Earth tides removed. The top plot shows variations in LOD since 1973, while the bottom plot shows LOD variations for the last 5 years.