البيانات والتراخيص
Map: Natural Earth 1:50m admin-0 countries (public domain), via world-atlas countries-50m, clipped to the region for these pages. Era texts and citations: this project's dataset, sources listed per era. Area-of-control polygons: db/extents/<era-id>.geojson, drawn only when each feature cites a source; always approximate.
External atlases reviewed (licence → reuse here)
| OpenHistoricalMap | CC0 (per-feature license tags) | yes, per feature |
| World Historical Gazetteer | CC BY 4.0 public data + per-dataset licence | yes, per dataset |
| Seshat (current public data) | CC BY-SA 4.0 | yes, share-alike |
| CShapes 2.0 | CC BY-NC-SA 4.0 | no |
| GeaCron | All rights reserved | no |
| Euratlas | Proprietary | no |
| Running Reality | No mass distribution of raw data | no |
| World History Maps | CC BY-NC-ND 3.0 US + permission | no |
| Chronas | unverified | no (until verified) |
Licences checked 2026-10-20; see web/UX-RESEARCH.md.