Here, I present a rigorous, multi-scale test of the Universal Internal Coherence (UIC) principle, which posits a fundamental relationship between the fractional deviations of the speed of light (δc/c0) and spatial geometry (δπ/π0) such that their sum SUIC ≡ δc/c0 + δπ/π0 = 0. A non-zero value would imply a violation of the minimal coherence hypothesis of General Relativity. Using a curated, 100% observational dataset of six sources—spanning Solar System-scale constraints from Cassini- Shapiro to cosmological-scale constraints from strong lensing (SLACS, TDCOSMO/H0LiCOW)—we perform a robust Monte Carlo analysis with inverse-variance weighting. We find the global weighted mean to be SUIC = (−2.31±2.31)×10−5. This result is consistent with the null hypothesis (SUIC = 0) at the 1σ level (z = −1.00, p = 0.316). The analysis, while dominated (99.9% weight) by the high-precision local δc/c0 constraint, confirms the internal coherence of the ΛCDM model across disparate scales and observational regimes.
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