Aryabhata Said the Earth Rotates — 1,000 Years Before Copernicus

In 499 CE, a 23-year-old scholar in Kusumapura (near modern Patna) completed a slim book of 121 verses that changed science forever. The Aryabhatiya of Aryabhata contains insights that Europe would not accept for another thousand years.

What Aryabhata got right in 499 CE

• Earth's rotation: "Just as a man in a boat moving forward sees the stationary objects on the bank as moving backward, so are the stationary stars seen by people at Lanka as moving exactly towards the west." (Aryabhatiya, Gola 9)
• Pi to four decimal places: he gave the ratio 62832/20000 = 3.1416, and — remarkably — called it asanna ("approaching"), suggesting he understood pi could not be expressed exactly.
• Scientific explanation of eclipses: he stated that lunar eclipses occur when the Moon enters the Earth's shadow — replacing myth with geometry, and he calculated eclipse timings.
• Length of the sidereal year: 365 days, 6 hours, 12 minutes, 30 seconds — within minutes of the modern value.
• The Moon shines by reflected sunlight, as do the planets.
• Trigonometry: his sine tables (jya) are the ancestor of the modern sine function — even the word "sine" derives, through Arabic and Latin mistranslation, from the Sanskrit jya.

Recognition across the world and across time

Aryabhata's works were translated into Arabic (as Arajbahara) by the 8th century and shaped Islamic astronomy, which in turn shaped Europe's. In 1975, independent India honoured him by naming its first satellite "Aryabhata" — a fitting tribute from a spacefaring nation to the man who set its scientific tradition in motion.

Why this should make you proud

Aryabhata did not work in isolation. He stood in an unbroken Indian tradition of jyotisha (astronomy) going back to the Vedanga Jyotisha, and he was followed by giants like Varahamihira, Brahmagupta and Bhaskaracharya. For over a thousand years, India was the world's mathematics and astronomy superpower.