Aryabhata-ji, he gave us that sweet ratio, pi, as "chaturadhikam satam ashtagunam" – 62,832 over 20,000, which is so clever! And his *jya* and *kojya* are our sine and cosine. But "earth's rotation"? No, baba. In our old *jyotish* texts here, we still calculate the planetary movements based on the *bhagola*, the celestial sphere turning. I teach the kids using the old ephemeris, and the sunrise *does* chase the darkness; we see it every morning from our hills.
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