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“Pañcasiddhāntikā XII (505 CE) preserves the Paitāmaha Siddhānta: a five-year luni-solar calendar of 1,830 civil days, intercalating every 30 months, with its epoch at the asterism Dhaniṣṭhā — the winter-solstice marker of the Vedāṅga Jyotiṣa tradition, datable by precession to c. 1400–1200 BCE. Varāhamihira transmits the system faithfully while ranking it "far from the truth" — the Indian canon documenting and superseding its own oldest astronomy. ”