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IERS Message No. 546                                    January 12, 2026
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Bias in C04 x pole coordinate (April - November 2025)


From April 2, 2025 to November 12 2025 a spurious bias of about 30
micro-arc-second has been detected in x pole coordinate of the C04
combined solution. 
Bias is eliminated from November 12 2025, and from this date C04
x pole coordinates present a closer agreement with IGS final solution.

Christian Bizouard
IERS Earth Orientation Centre


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