Statistical Analysis of Ancient Monumental Site Distribution Along a Proposed Great Circle: Evidence from 96,383 Sites Across Two Independent Databases

We present a quantitative analysis of the spatial distribution of ancient archaeological sites relative to a previously proposed great circle alignment (Alison, c. 2001). Using 61,913 sites from the Megalithic Portal database and 34,470 sites from the Pleiades Gazetteer — two independent databases with zero methodological overlap — we test whether ancient monumental sites cluster near this specific great circle beyond what their geographic distribution predicts. Using distribution-matched Monte Carlo simulation (200 trials), we find significant enrichment within 50 km of the proposed circle (319 observed vs 89 expected, Z = 25.85, 3.6× enrichment). The pattern is age-dependent (prehistoric Z = 20.86, later Z = 8.30, ratio 2.5×), type-specific (geoglyphs 64× enrichment, pyramids 36×, stone circles 0%), and independently replicated on the Pleiades Gazetteer (pre-2000 BCE Z = 10.68). A settlement baseline test rules out geographic coincidence: ancient monumental sites show Z = 11.83 (5.05× enrichment) while ordinary settlements in the same regions show Z = -0.95 (below random expectation). The aligned sites cluster in six geographically distinct segments corresponding to Egypt/Levant, Peru/Andes, Easter Island, Iran, the Indus Valley, and Southeast Asia — four of the six academically recognized independent origins of civilization. We also test the 108° angular separation hypothesis and find it falsified (Z = -1.38). Supporting evidence from ground-penetrating radar surveys, ice-age bathymetry, and paleoclimate reconstruction contextualizes the statistical findings. All code and data are openly available for replication.