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Global Time Echoes: Distance-Structured Correlations in GNSS Clocks — Multi-center analysis of 62.7M station-pair measurements across CODE, IGS, and ESA (364 stations, 2023–2025) revealing distance-structured clock correlations (λ_T = 3,330–4,549 km) and autocorrelation-corrected orbital velocity coupling (r = −0.763, ~3.0σ).