states that Gangapuri is 11 yojanas from Kharanagara and is to the east[१] of the Hindu prime meridian.
5. WORKS OF SURYADEVA
1. Known works
Suryadeva was primarily a commentator both on astronomy and astrology. No original work of his has been unearthed. His known works are: 1. Com. on the Aryabhatiya of Aryabhata (b. A. D. 476)
2. Com. on the Laghumanasa of Munjala (A. D. 932)
3. Com. on the Jatakapaddhati of Sripati (A. D. 1039)
4. Com. on the Mahabhaskariya-vyakhya of Govindaswami.
5. Com. on the Yoga-yatra of Varahamihira (A. D. 505)
6. Com. on the Khandakhadyaka of Brahmagupta (A. D. 628)
Of the six works mentioned above, manuscripts of the first three are available but the last three are known only from references to them by the author himself.
2. Chronology of the works
The ascertainment of the chronology of Suryadevas works does not pose a problem, for he himself gives the order of his works. Thus, towards the close of his commentary on Laghumanasa, he says:
- ↑ Cƒ.: चोलदेशे गङ्गापुर्याः खरनगरस्य च अन्तरे योजनात्मकोऽध्वा ११:...इदं रेखायाः पूर्वदेशे स्थितत्वात् गङ्गापुर्या चन्द्र क्षयं कृत्वा शेषो देशान्तरसंस्कृतश्चन्द्रमध्यमो भवति। (Com. on LMa. iii. 3).
It may be noted here that hitherto it had been held that Suryadeva hailed from Kerala, but without any substantial proof. Vide Ulloor, Kerala Sahitya Charitram, (Trivandrum, Vol. II, 1954), p. 97; Vatakkumkur Rajaraja Varma, Keraliya Samskrita Sahitya Charitram, (Vol. I, Trivandrum, M. E. 1113). 390-92. K. K. Raja, 'Astronomy and mathematics in Kerala', (Adyar Library Bulletin, 27 (1963), 131-32); and the writer, history of the Kerala school of Hindu astronomy (Hoshiarpur, 1972), p. 48.
