Have you ever wondered how astronomers predict the exact position of a distant galaxy or track a probe hurtling through the outer solar system? It isn't done with the wall-clock on your microwave. To the cosmos, our human-made calendars are a chaotic patchwork of political decisions and leap seconds. For an AI model or a precise calculation, this simply won't do. You need a clock as linear and unambiguous as the universe itself. In this chapter of our journey through Astrophysics & AI with Pytho