Jyotihshastra: Astral and Mathematical Literature c4.s2.75

c4.s2.75

For approximately 350 years after the composition of the SŚB no important siddhānta was written; the learning of astronomers was rather concentrated in commentaries, their ingenuity in koṣṭhakas. It was, however, probably during this period that a group of minor siddhāntas belonging to the Saurapakṣa, but attributed to deities or sages, were written. These are the Somasiddhānta,⁸⁵ on which a commentary, Gūḍhārthadīpikā, was composed by Nṛsiṃha⁸⁶ at Koṇḍavīḍu in Āndhrapradeśa in about 1400; a Vasiṣṭhasiddhānta⁸⁷ which claims to be based on that of Viṣṇucandra; a Vṛddhavasiṣṭhasiddhānta,⁸⁸ which is influenced by the Brāhmapakṣa in its planetary equations; and the Brahmasiddhānta⁸⁹ alleged to be part of a Śākalyasaṃhitā.