ब्राह्मस्फुटसिद्धान्त (ब्रह्मगुप्त - शून्य, कुट्टक, बीजगणित एवं सम्पूर्ण २१ अध्याय सान्वय सटीक)

68 BRĀHMSPHUṬA SIDDHĀNTA & KHAṆḌAKHĀDAYAK we have difficulty. The Sūryasiddhānta, as summarised by Varāhamihira in his Pañcasiddhāntikā, in many essential features differs from the system prescribed by the Text of the Sūryasiddhānta now available. So we have two versions, the one with which Varāhmihira was familiar and the modern one. The present Sūryasiddhānta comprises of fourteen chapters called adhyāyas. We have an authentic commetary on it by Parameśvara. The first two chapters of the Sūryasiddhānta have no special name. The classification of chapters is as follows : Modern Sūrya Siddhānta Chapter Name of the Number Chapter of verses Subject I — 69 Mean longitude of planets. II — 68 True motion and true longitude of planet ; and elements of Pañ- cāṅga. III Tripraśnādhyāya 50 Directions, place and time. IV Candra-grahaṇā- 29 Lunar eclipse. dhyāya V Sūrya-grahaṇādh- 17 Solar eclipse. yāya VI Chedyakādhyāya 24 Projection of eclipse on a plane surface. VII Graha-samāgama- 24 Conjunction of one yuddhādhyāya planet with another. VIII Tārāviṣayodhyāya 21 Conjunction of a Planet with the junc- tion star of a nakṣatra. IX Udayāstamaya-vi- 18 Heliacal rising and ṣayodhyāya setting of planets. X Candrāstamayādi 16 Moon rise and eleva- viṣayāḥ tion of Moon-horn. XI Vyatīpāta-viṣayāḥ 23 Pāta (vyatīpāta) XII — 87 Cosmogony and geo- graphy