Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s2.t3.9
Bhāratīya Jyotiḥśāstra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s2.t3.9
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v2.c12.s2.t3.9
This shows that the Pauliśa Siddhānta was very clear at the time of the compilation of Pañcasiddhāntikā, which means that its calculations very much agreed with the actual observed positions. The Romaka was nearer to it in correctness. The Sūrya-Siddhānta was better than both and the remaining two (Vasiṣṭha and Pitāmaha) were far removed from correctness meaning that their calculations did not agree with the observed results. The Pitāmaha Siddhānta and Vasiṣṭha Siddhānta must have been the oldest of the five, and of the these two, in the author’s opinion, Pitāmaha Siddhānta must have been the more ancient. The reasons for this will be given later on. Let us now consider the Pitāmaha Siddhānta.