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“Varāhamihira's Pañcasiddhāntikā (505 CE) summarizes and ranks five astronomical schools; the Romaka ("Roman") Siddhānta places in the top three. Its luni-solar yuga of 2,850 years with 1,050 intercalary months is exactly 150 Metonic cycles (19 years, 7 intercalations each), and its epoch is reckoned from sunset at Yavanapura — Alexandria. Greco-Roman astronomy circulated inside the Indian canon, openly named and rated. ”