Lalla, an eighth century Indian astronomer, was an exponent of the school of astronomy founded by Āryabhaṭa (b. AD 476). He was the son of Tāladhvaja and grandson of Sāmba alias Trivikrama, and hailed from Daśapura in Mālava in Western India.
Lalla was a popular astronomer who wrote both on astronomy and astrology. His most important work is the Śiṣyadhīvṛddhida (Treatise Which Expands the Intellect of Students), which, as he says, was composed to expatiate astronomy as set out by Āryabhatṭa. He uses the parameters enunciated in the Āryabhaṭīya, but propounds corrections to them every 250 years commencing from AD 498, the time of Āryabhaṭa. The first such correction falls in AD 748, which gives an indication of Lalla's date. The Śiṣyadhīvṛddhida is in two sections, entitled Grahādhyāya, dealing with planetary computations, and Golādhyāya, dealing with spherics, and theoretical and cosmological material. The first section, which is comprised of chapters I–XIII, treats of the mean and...
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Chatterji, Bina. Śiṣyadhīvṛddhida Tantra of Lalla with the Commentary of Mallikarjuna. 2 vols. New Delhi: Indian National Science Academy, 1981.
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Sarma, K.V. (2008). Lalla. In: Selin, H. (eds) Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4425-0_9577
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