Lalla
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{{for|other people named Lalla|Lalla (disambiguation)}}
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'''Lalla''' ([[720]] - [[790]]) was an [[India]]n [[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 [[Sidereal day|rotation of the Earth]]. He is also known for having published the earliest known description of a ''[[perpetual motion|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 of Lalla was lost
English Translations:
* Bina Chatterjee, ''Sisyadhivrddhidatantra of Lalla'' (critical edition with Commentary of Mallikarjuna Suri), 1969-71. Published by INSA, 1981.
* Bina Chatterjee, ''Sisyadhivrddhidatantra of Lalla'' (English translation with mathematical notes.) 1969-71. Published by INSA, 1981.
INSEA: Indian National Science Academy
== References ==
* {{MacTutor Biography|id=Lalla}}
* 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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[[Category:Indian astronomers]]
[[Category:Indian mathematicians]]
[[Category:Indian mathematics]]
[[Category:Medieval astronomers]]
[[Category:8th century mathematicians]]
[[Category:720 births|Lalla]]
[[Category:790 deaths|Lalla]]
[[de:Lalla]]
[[hi:लल्ल]]