Calendrical Constraint and Solar Geometry at Teotihuacan (Studies 1–4)

This record contains a compiled research volume consisting of four related studies examining calendrical constraint, solar geometry, and urban configuration at Teotihuacan (central Mexico). Each study is preceded by a non-technical summary intended to make the core arguments accessible to interdisciplinary readers. The studies address, in sequence:(1) the physical existence and magnitude of calendrical drift in a non-intercalated 365-day civil calendar;(2) the organizational requirements for detecting and managing that drift at urban scale without mechanical instruments;(3) the preservation of a latitude-dependent solar geometry through horizon-based observation at Teotihuacan (“geodesic mimicry”); and(4) the embodied observational interface through which such a system could be operated in practice. All analyses are constraint-based and rely on established solar mechanics, archaeological orientation data, environmental limits, and published scholarship. No claims are advanced regarding calendrical origins, symbolic meaning, ritual practice, or cultural transmission beyond what is explicitly demonstrated. Simulation tools, where used, serve only for verification and reproducibility rather than as primary evidence. This compilation is intended as a research packet for scholarly review and discussion. Individual studies are internally complete and may be read independently.