It's about redundancy and failure modes. The fine article mentions this. What if GPS is jammed or spoofed? What do you do then? Celestial navigation gives a fal

It's about redundancy and failure modes. The fine article mentions this. What if GPS is jammed or spoofed? What do you do then? Celestial navigation gives a fallback (albeit with less accuracy). Regarding your side project - Google Sky does the opposite already. Point your phone at the sky, and it tells you what stars, planets, constellations, etc are there.