Aryabhatiya
Aryabhata composes the Aryabhatiya
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Original prompt & settings (JSON) ↗He explained the moving night sky with an everyday illusion: the riverbank appears to slide backward when your boat moves forward.
Not 511 — 499, from a single verse
No consulted source supports an event in 511. The Aryabhatiya instead records that Aryabhata was 23 when 3,600 years of the Kali era had elapsed — an epoch calculated as 499 CE.
Most commentators treat that as the work’s approximate composition date.
The verse may strictly identify a computational epoch rather than a date of writing, and the traditional birth year of 476 follows only from treating both the epoch and the stated age as exact.
121 verses
The treatise set out rules and tables covering arithmetic, algebra, geometry, timekeeping and astronomy in 121 compact verses.
Its rule for a circle’s circumference gives 62,832 divided by 20,000 — that is, 3.1416 — as an approximation of pi.
Aryabhata encoded numbers with Sanskrit letters and powers of ten: positional notation without a written zero symbol, not the invention of zero as a number.
The boat on the river
To explain the apparent westward motion of the stars relative to a rotating Earth, Aryabhata used the analogy of a person in a moving boat seeing stationary objects move backward.
The analogy concerns Earth’s daily axial rotation, not an annual orbit or a heliocentric system.
The text says the science it presents is honoured at Kusumapura, which does not securely establish where Aryabhata was born.
Sources
Researched 23 Aug 2026 5 sources not yet audited Date disputed
How this was checked
Researched from the web into a fact sheet and rewritten from that sheet. This article has not yet had an independent model audit. How the pipeline works →
Date disputed. Sources disagree; the research places it at ~0499.
What the sources leave uncertain
- The listed year 511 is unsupported by the consulted textual and scholarly sources.
- The year 499 is derived from an internal chronological verse. Most commentators associate it with composition, but the verse may strictly identify a computational epoch rather than a publication date.
- The traditional birth year 476 follows from treating both the 499 epoch and Aryabhata's stated age of 23 as exact.
- The text's Kusumapura reference has been interpreted in different ways and does not securely prove that Aryabhata was born there.