Jyotihshastra: Astral and Mathematical Literature c4.s3.15

c4.s3.15

Al-Bīrūnī also refers in the India to two karaṇas by Muñjāla.¹²³ The Bṛhanmānasa, whose epoch is 9 March 932, is now lost except for some fragments; but we still possess the Laghumānasa,¹²⁴ which Muñjāla composed later at Prakāśa on the Tāpī in Mahārāṣṭra. This small karaṇa has drawn elements from both the Āryapakṣa (as corrected by Lalla) and the Ārdharātrikapakṣa; it has also, apparently, derived the notion of the second inequality in lunar motion from an Islamic Ptolemaic source. Though it is a karaṇa, the LM does not give epoch positions (apparently one was expected to use those of the Bṛhanmānasa), and its contents are arranged in the form of a siddhānta. There are commentaries on the LM written by Praśastadhara (or Praśastidhara)¹²⁵ (Vivṛti) in Kāśmīra in 958; by Sūryadeva Yajvan (Grahajñānavāsanā) in 1248 at Gaṅgāpura in Cola country;¹²⁶ by Parameśvara (Pārameśvara) at Aśvatthagrāma in Kerala in 1409; and by Yallaya (Kalpalatā) at Skandasomeśvara in Āndhrapradeśa in 1482.