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A thousand years before Galileo, an Indian mathematician climbed onto a rooftop in Pataliputra and worked out the correct cause of eclipses. Five centuries before Newton, another Indian derived the principle of gravity. The story of Indian astronomy is not a footnote to Western science — it is a foundational chapter that the history books have been slow to write.
Before the great individual astronomers, India had the Surya Siddhanta — a Sanskrit astronomical treatise of disputed antiquity (some scholars date it to 400 CE, others to far earlier based on internal astronomical references). The Surya Siddhanta calculates:
A common misconception is that ancient Indians believed eclipses were caused by a serpent (Rahu and Ketu) swallowing the Sun or Moon. The truth is more nuanced. Astronomers like Aryabhata explicitly rejected the mythological explanation and provided the correct shadow-geometry explanation for eclipses as early as 499 CE.
The Rahu-Ketu model in Jyotish (astrology) was maintained separately from the astronomical explanation — functioning as a symbolic and predictive framework rather than a physical description. Rahu represents the Moon's north ascending node and Ketu the south descending node — the two mathematical points where the Moon's orbit intersects the ecliptic (Sun's path). Eclipses occur ONLY when the Sun and Moon are within a certain angular distance of these nodes — a fact known to Vedic astronomers who embedded it into the Rahu-Ketu symbolism.
Indian astronomers could predict eclipses centuries in advance with extraordinary accuracy using their node calculations — the same mathematical concept that modern astronomy uses today.