The corpus, every claim citable.

Surya-Siddhanta I.30 (~5th c. CE) gives Mars's revolutions per mahayuga (4,320,000 years) as 2,296,832. Period = 4,320,000 / 2,296,832 = 1.8809 sidereal years = 687.05 mean solar days. Modern Mars sidereal period (NASA): 686.971 days. Off by 0.08 days = ~2 hours over a 23-month orbit. ~120 parts per million accuracy, pre-telescopic. The same I.29-34 verse block gives every planet to this kind of precision.

Translation of the Surya-Siddhanta · tr. Ebenezer Burgess, 1860