पृष्ठम्:आर्यभटीयम्.djvu/48

xlviii ĀRYABHATÎYA We learn from the above that Yallaya was the son of Sridhararya and was a pupil of Suryacarya" son of Baladitya. This Śrīdhara (14th15th cent.) is, obviously, different from his namesake Sridhara (c. A.D. 900) who wrote the Patiganita and the Trisatika. Similarly, Suryacarya (14th-15th cent.) is different from Suryadeva Yajvan (b. 119 i), and is the author of Ganakananda, Daivajiabharana and Daivajiabhusana. A closing verse of his commentary Kalpalata on the Suryasiddhanta supplies the additional information that he belonged to the Kasyapagotra and that his grandfather's name was also Yallaya. Yallaya was a native of Skandasomesvara, which lay to the southeast of the renowned temple-town of Srisaila in the Telugu Country.* He indicates in his supplementary commentary on A., iii. 6 that he composed the work at Skandasomesvara, of which place he gives the measure of the equinoctial midday shadow as 3 angulas and the equinoctial midday hypotenuse as 125 angulas. These measurements specify a place having a latitude of 15' 30' N. Skandasomesvara is also stated to be 36 yojanas from the Hindu prime meridian (according to the reckoning of the Suryasiddhanta' which corresponds to 4° 5' to the east of the said meridian. यस्य यस्य सूत्रस्य सूर्यदेवेन यज्वना यद् व्याख्यानं कृतं तस्य (तस्य) श्रार्यासूत्रस्य तत् कृत्स्नं व्याख्यान लिखित्वा यत्र यत्र व्याख्यानं संक्षेप तत्र (तत्र) बहुपाटीगणितग्रन्थवित्त्रिस्कन्धार्थ विदा, श्रीमच्चन्द्रशेखरवरलब्धवाग्विभवेन, श्रीधराचार्यस्य पुत्रेण, श्री-बालादित्यसुतसूर्याचार्य शिष्येण श्री-यल्लयाख्येन विपश्चिता मया व्याख्यानमपि किञ्चिदधिकम्, उदाहरणान्तराणि ॥ च, क्रियते। 1. His name is given as 'Suryanarya' in the colophon to Yallaya's com. Kalpalata on Laghunanasa. 2. Cf. : Yalaya”s statement: Hätērē 2i ir 3 traftā fra: FERFGENÈRGI TIEGTqguy: (Com. on Surya siddhānta, i. 57-58). 3. Cf. : श्रीशैलस्य प्राग्नेधस्थित-स्कन्दसोमेश्वराख्यपट्टणे वृत्तिः (?) मया सम्यङ् निर्णीतं (?) विषुवत्प्रभा 3-20. तस्य द्वादशाङ्गुलशङ्कोः जनिताङ्गुलानि 3-20. विषुवTatif: 2-28. (Com. on A, iii. 6). 4. Cf. : स्कन्दसोमेश्वरस्य सिद्धान्तमागॉक्तषट्।त्रिशद् योजनानि । (Com. on A, iii. 6).