Скачать или смотреть Chandravakya-s in Tamil Texts of Astronomy | Atharva & IKS National Science Day 2025 | New Delhi

The Atharva Forum & IKS National Science Day 2025 | Session 1 | Prof MD Srinivas, Padma Shri | Prof V Ramanathan, IIT BHU | Prof Venketeswara Pai, IISER Pune

Indian texts of astronomy and mathematics use systems of numeration where words or sequences of syllables are used to denote pure numbers or values of astronomical quantities such as the longitude etc. Three such systems, namely the Bhūtasaṅkhyā system, the Āryabhaṭīya system and the Kaṭapayādi system, are well known and have been widely discussed in the literature. In this discussion, the authors share a novel and ingenious vowel (uyirêḻuttu in Tamil, svara in Sanskrit) based system of numeration which has been used in the late 12th or 13th century Tamil astronomy text, Cūḍāmaṇi Uḷḷamuḍaiyān, of Tirukkoṭṭiyūr Nambi. It is also shown that using this numeration system, Cūḍāmaṇi Uḷḷamuḍaiyān presents what is perhaps the earliest available account of the vākya system for computing the longitude of the moon. It is also indicated how the same system has been employed in later Tamil texts of astronomy and in the formulation of the 248 Candravākyas in Tamil, which are referred to as the Pañcāṅgavākyas.
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An Uyirêḻuttu or svara-based system of numeration used in Tamil astronomy texts | Article | Published: 27 June 2025 https://link.springer.com/article/10....
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0:00 Introduction by Anand Viswanathan
01:22 What are Chandravakya-s - Prof MD Srinivas
05:59 What are Tamil texts of astronomy - Prof MD Srinivas
07:00 Calculation of lunar eclipse in India - cited by John Warren in Kala Sankalita
07:45 French Astronomer Le Gentil visited India to observe a rare occurrence - the transit of Venus
10:00 Representation of numbers - Prof MD Srinivas
20:39 Katapayadi System - Prof Venketeswara Pai
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Chandravakya-s in Tamil Texts of Astronomy | Atharva & IKS National Science Day 2025 | New Delhi
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