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“Sūrya-Siddhānta iv.1 gives the Moon's diameter as 480 yojanas; with the Earth's diameter fixed at 1,600 yojanas (i.59), the implied Moon-to-Earth size ratio is 0.30, against a true value of 0.27 — accurate to about ten percent. The same verse's solar diameter (6,500 yojanas ≈ 4 Earth-diameters) is too small by a factor of ~27: lunar parallax was within naked-eye reach and solar parallax was not. The accuracy tracks the observable. ”