**Title:**Geomagnetic Grid Structure in the Distribution of Ancient Sites and Biological Migration Endpoints **Description:** **Version 3 — Corrected Reference Point (March 12, 2026)** A coordinate rotation framework reveals statistically anomalous spatial structure in the global distribution of archaeological sites and biological migration endpoints. The rotation places 61°N, 84°E (Western Siberia) — the growing strong geomagnetic field region documented by ESA's Swarm satellite constellation — as the new pole, and computes absolute rotated latitude for each site. **Verification:** The rotation function returns exactly 90.0° for the reference point, confirming mathematical correctness. **Key findings across three independent archaeological datasets:** 232 curated ancient sites: 78.0% in bands, Band B median 46.2°, dead zone p = 7.34 × 10⁻⁷ 1,012 UNESCO World Heritage cultural sites: 69.1% in bands, Band B median 47.9°, dead zone z = -6.00 15,028 radiocarbon-dated sites from the p3k14c database (Nature Scientific Data, 2022): 71.6% in bands, Band B median 46.8°, dead zone z = -21.76, KS statistic 16.2x critical value The Band B median remains between 45.8° and 47.3° across nine independent time slices spanning 12,000 years (pre-10000 BCE through post-1500 CE). Biological migration endpoints for species with proven magnetoreceptive navigation — monarch butterflies (CRY1 compass), loggerhead sea turtles (magnetic imprinting), and European eels — independently cluster in the same band structure. All code is self-contained Python 3 with no external dependencies. Results are fully reproducible. **Note on version history:** Versions 1 and 2 labeled the reference point as Hudson Bay (61°N, 96°W). The rotation function in those versions was mathematically equivalent to a correct rotation with pole at 61°N, 84°E. All numerical results are identical across all versions. Version 3 corrects the label to match the actual mathematical pole.