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

BRAHMAGUPTA'S OWN REFERENCES 51 Brahmagupta's own References In the Twenty-fourth Chapter (Sañjñādhyāya), of the Brāhmasphuṭasiddhānta, Brahmagupta has made a reference to his own biography : In the reign of Vyāghramukha belonging to the family of Cāpa, in the year 550 Śaka the treatise Brāhmasphuṭasiddhānta was composed for the benefit of benevo- lent astronomers by Brahmagupta, son of Jiṣṇugupta at the age of 30. (BrSpSi. XXIV. 7. 8) Then again he says : The Brāhmasphuṭasiddhānta has been written by Brahmagupta, son of Jiṣṇu, in 1008 verses of Āryāch- anda. (ibid 10 ) In the beginning of this Sañjñādhyāya, he refers to the differences in fundamental notions created by the various existing systems of astronomy as the Sūrya-siddhānta, Pulisa-siddhānta. Romaka-siddhānta, Vasiṣṭha-siddhānta and other Yavana-siddhā- ntas, which have caused anomalies in the calculations of eclipses. He also refers to the anomalies due to the calculations based on midnight day-reckoning and sunrise day-reckoning. From the point of view of own references, the following would be of interest : Brahmagupta, son of Jiṣṇugupta (Jiṣṇusuta-Brahmagupta) : BrSpSi. I. 2; XVI. 35. 37; XXIV. 8. 10; XXV. 73. It is strange that in the Khaṇḍakhādyaka, Brahmagupta has not given his name nor his father's name anywhere. At least the reading of the Khaṇḍakhādyaka as given by Pṛthūdakasvāmī does not contain this name. In the edition of Bhaṭṭotpala, there are three more chapters in the Khaṇḍakhādyaka (Chapters IX, X and XI). In the Chapter XI (known as Pātādhikāra), we have 21 verses and in the last 21st verse we find the name of Brahmagupta,¹ son of Jiṣṇu mentioned : Those who are eager to have the knowledge of the motion of stars and planets, for them and for the benefit of disciples in this field, Brahmagupta son of Jiṣṇu has composed this Khaṇḍakhādyaka.

1. खण्डखाद्यकमिदं तृप्त्यर्थं ग्रहगतिश्रुतात्तांनाम् । शिष्याणां हितार्थं प्रोक्तं जिष्णुसुतब्रह्मगुप्तेन ॥ — KK. XI. 21