Jyotihshastra: Astral and Mathematical Literature c4.s2.68

c4.s2.68

But the most notable siddhānta produced in India is the Siddhāntaśiromaṇi⁷⁹ written by Bhāskara⁸⁰ at Vijjaḍaviḍa (?) probably in his native Sahyādri north of Devagiri in 1150. Modelled in form on Lalla’s ŚDV (though with the addition of a chapter on the trigonometrical functions, jyotpatti and of another describing the seasons) the SŚB is the foremost text of the Brāhmapakṣa after the BSS. Bhāskara changes a few parameters minutely, repeats some of the improvements introduced by earlier astronomy such as the equation of time, and presents for the first time the formula for finding Sin (α + β),⁸¹ but the most impressive quality of the SŚB is its comprehensiveness. Commentaries on the SŚB were composed by, among others, Bhāskara himself (Mitākṣarā); by Lakṣmīdāsa in 1501 (Gaṇitatattvacintāmaṇi); by Gaṇeśa⁸² at Nandipura in Gujarāt in the early seventeenth century (Śiromaṇiprakāśa); by Nṛsiṃha⁸³ at Kāśī in 1621 (Vāsanāvārttika) and by Munīśvara⁸⁴ at Kāśī before 1638 (Marici).