* **Camille Flammarion** — *Astronomy for Amateurs* (early 1900s translations) *Star charts & cosmic wonder; perfect for “where you are now” inserts.* * **Robert S. Ball** — *A Popular Guide to the Heavens* (1890s editions) *Constellations as wayfinding—turn into interstellar navigation entries.* * **A. M. Clerke** — *A Popular History of Astronomy* (1885) *Historical context for “Galactic Guide” timelines.*