🛰️ GPS III-8 completes a constellation that every smartphone, every ship, every aircraft and every missile guidance system on Earth depends on. The detail most people never learn is that without Einstein's general relativity corrections built into the software, the entire system would drift by 10 kilometers per day. A satellite network that underpins the global economy requires corrections from equations written in 1915 by a man who died before the transistor existed. The final piece of that network launched today on a rocket whose booster landed itself back on the ground to fly again. Two scientific revolutions separated by a century. Both running simultaneously inside the same mission. 📌 Source: US Space Force GPS III constellation, Einstein relativity GPS correction physics