Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s2.t87.7

v2.c12.s2.t87.7

∗ (Beruṇī has referred to the Āryabhaṭa of Kusumpūr and to another Āryabhaṭa who lived earlier. The author could not obtain the work of the older one, but Beruṇī remarks that the Āryabhaṭa of Kusumpūr was his follower. Both of them have been referred to by Beruṇī at 30 places. After reading all those passages, it is found that the description completely applies to the first of the two Āryabhatas formerly described (page 51 and 95) The number of revolutions of planets and such other matters referred to by Beruṇī as to differentiate one from the other very clearly, do not apply to the second Āryabhaṭa, and he was not the follower of the first. From this it follows that the two Āryabhatas referred to by Beruṇī are in fact, one and the same person. Even Prof. Sachau, did not note this fact pointed out here. The second Āryabhaṭa who figures in the auhors account, may have lived before Beruṇī, and although it is evident that his work was not seen by Beruṇī, it appears that he laboured under a misunderstanding due to hearsay reports about the existence of two Āryabhata. This leads to the inference that Āryabhaṭa II, may have lived only a century or a half before Śaka 950, and confirms the author’s former estimate of his date.