Śrīpati (c. 1019 – 1066), also transliterated as Shri-pati, was an Indian astronomer, astrologer and mathematician. His major works include Dhīkotida-karana (1039), a work of twenty verses on solar and lunar eclipses; Dhruva-mānasa (written in 1056), a work of 105 verses on calculating planetary longitudes, eclipses and planetary transits; Siddhānta-śekhara a major work on astronomy in 19 chapters; and Gaṇita-tilaka, an incomplete arithmetical treatise in 125 verses based on a work by Shridhara. Biography Śrīpati was born in Rohinikhanda in present-day Maharashtra, and lived during c. 1019-1066. His father was Naga-deva (sometimes written as Namadeva) and his grandafther was Kesava. Śrīpati followed the teachings of Lalla, and wrote on astrology, astronomy and mathematics. He was mainly focused on astrology, and his work on astronomy was aimed at supporting his research on astrology; his work on mathematics, in turn, was aimed at supporting his work on astronomy, such as the study of spheres. Śrīpati had introduced one of the main methods of house division in Jyotiṣa, known as Śrīpati Bhāva system. Works Dhīkotida-karana Dhīkotida-karana (1039) is 20-verse text that discusses solar and lunar eclipses. Commentaries on this text include: An udaharana (1610) by Ramakrishna Bhatta A tippana by Dinakara, known from a manuscript copied in 1823 Dhruva-mānasa Dhruva-mānasa (1056) is a 105-verse text on calculating planetary longitudes, eclipses and planetary transits. Siddhānta-śekhara Siddhānta-śekhara (Siddhanta-shekhara) is a major work on astronomy in 19 chapters. Some of the notable chapters include: Chapter 13: Arithmetic; comprises 55 verses on arithmetic, Measurement, and shadow reckoning. Chapter 14: Algebra discusses various rules of algebra without proof, in verbal form (without algebraic symbols) Contains rules of signs for addition, subtraction, multiplication, division, square, square root, cube and cube root of positive and negative quantities Contains the rule for solving a quadratic equation Chapter 15: Sphere The work also contains the rules for the solution of simultaneous indeterminate equations of the first degree; these rules are similar to those given by Brahmagupta. Gaṇita-tilaka Gaṇita-tilaka is an incomplete, 125-verse treatise on arithmetics, based on a work by Shridhara. Its lost portion possibly consisted of the verses 19-55 of Chapter 13 of Siddhānta-śekhara. Jyotiṣa-ratna-mālā Jyotiṣa-ratna-mālā (Jyotisha-ratna-mala) is a 20-chapter text on astrology, based on the Jyotisha-ratna-kosha of Lalla. Śrīpati wrote a commentary on this work in Marathi language: this is one of the oldest surviving Marathi-language works. Commentaries on this text include: Balavaodha by Damodara Pandita Bala-bodhini by Parama-Karunika Bala-bodhini,