This paper presents a plausibility gradient for interpreting monumental geometric structures as expressions of coherent field alignment rather than symbolic, cultural, or force-based constructions. Using a base-12 relational framework and Relative Phase Resolution (RPR) mapping, the paper examines how recurring architectural forms align with planetary harmonic zones, light distribution, and electromagnetic coherence bands. The analysis does not assert historical intent or function. Instead, it evaluates structural equivalence between idealized geometric solutions and observed global monument classes, showing consistent convergence under shared constraints. The result is a non-speculative geometric lens through which large-scale architectural patterns may be compared across latitude, environment, and energetic context. coherence geometry, relative phase resolution, planetary harmonics, base-12 systems, pyramidal geometry, monumental architecture, electromagnetic coherence, harmonic zones, latitude geometry, subsurface chambers, phase alignment, spherical partitioning, ambient fields, geometric equivalence, structural convergence, symmetry, inversion geometry, light distribution, infrared absorption, ultraviolet balance, dark stone materials, ionic mediation, RPR mapping, non-force systems, planetary EM fields, architectural coherence, geometric constraints, harmonic stability, environmental alignment, tetrahedral forms, truncated pyramids, inverted geometry, phase buffering, spectral interaction, global monument patterns, coherence fields, geometric primary organizers, field stabilization, architectural symmetry, planetary mapping, structural classes