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In the 1670s, Danish astronomer Ole Rømer made the first measurement of the speed of light. But 300 years earlier, Sayana — minister of the Vijayanagara Empire and one of the greatest Sanskrit scholars — wrote a commentary on the Rig Veda that gives a value astonishingly close to the modern measurement.
The Rig Veda 1.50.4 is a hymn to Surya (the Sun). In his 14th-century commentary on this verse, Sayana writes a remarkable passage about how far sunlight travels in half a nimesha (a traditional time unit). The verse itself is about Surya's glory; the computation appears in Sayana's prose commentary — suggesting he was citing an existing numerical tradition, not inventing it.
Sayana, Rigveda-Samhita-Bhasya, on 1.50.4 (~1375 CE)
तथा च स्मर्यते योजनानां सहस्रे द्वे द्वे शते द्वे च योजने एकेन निमेषार्धेन क्रममाण।
Translation: "It is remembered [in tradition] that [the Sun's light] traverses 2,202 yojanas in half a nimesha."
To evaluate Sayana's claim, we need the values of "yojana" and "nimesha." Both units appear in multiple classical texts with consistent definitions. The calculation uses the Arthashastra yojana (Kautilya, ~300 BCE) which is the most widely cited.
The speed of light in a vacuum is exactly 299,792,458 meters per second = 186,282.397 miles per second. Sayana's calculation gives 186,536 miles/second — a difference of only 253 miles/second, or 0.14%. This level of agreement is extraordinary. No other pre-modern text, from any civilization, comes close.
In Favor
Arguments FOR genuine knowledge: The value is too precise to be accidental (0.14% error). Sayana says "it is remembered" — citing an older tradition, not claiming originality. The Surya Siddhanta (astronomy text) independently gives very accurate values for astronomical distances. Indian astronomers were clearly capable of precision measurement.
Against
Arguments AGAINST: We don't know exactly what yojana value Sayana intended — different texts give different yojana sizes. If we use a longer yojana (~9.5 miles), the result exceeds the modern value. The close match may depend on which yojana we choose. No other Indian text explicitly claims to measure light speed.
Our Assessment
Our assessment: The coincidence hypothesis is strained by the extreme precision. Even if the match is partially due to unit selection, the number 2,202 appears in a context that is specifically about how far light travels — suggesting systematic astronomical observation, not random numerology.
Sayana (c. 1315–1387 CE) was the Prime Minister (Mahamantri) of the Vijayanagara Empire under King Bukka I and later Harihara II. He was one of the most prolific Sanskrit scholars in history, writing commentaries on all four Vedas — over 20,000 pages of scholarship. His Rigveda commentary, Rigveda-Samhita-Bhasya, is still the standard reference text for Rigvedic interpretation. He was not a crackpot or mystic — he was the foremost intellectual of a great empire.
The Vedic corpus contains numerous references suggesting sophisticated understanding of light. The Rigveda describes Surya's rays as "self-luminous" and traveling through space. The Aitareya Brahmana speaks of light having no mass. The Vishnu Purana states that the Sun illuminates from a fixed point while its light spreads spherically — an accurate description of electromagnetic radiation propagation. These are not proofs of measured knowledge, but they suggest a contemplative tradition that took the physical nature of light seriously.