Lalla

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Lalla (720 - 790) was an Indian mathematician, astronomer, and astrologer who belonged to a family of astronomers. His most famous work was entitled Shishyadhividdhidatantra, or "Treatise Which Expands the Intellect of Students." He did not believe in the rotation of the Earth. He is also known for having published the earliest known description of a perpetuum mobile in Shishyadhividdhidatantra.

In his work, Lalla drew on his predecessors Aryabhata, Brahmagupta, and Bhaskara I. In turn, he influenced later generations of astronomers, including Sripati, Vateswara, and Bhaskara II.

Publications

• Jyotisaratnakosa. Most popular astronomy book in India for 300 years.
• Shishyadhividdhidatantra
• Ratnakosa - on astrology
• Another work

INSEA: Indian National Science Academy

References

• O'Connor, John J.; Robertson, Edmund F., "Lalla", MacTutor History of Mathematics archive .
• K. V. Sarma. "Lalla." Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures, ed. Helaine Selin, p. 508. Dordrecht: Kluwer Academic Publishers, 1997.

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