Surya-Siddhanta III.9 (~5th c. CE) gives a rate for the precession of the equinoxes — 600 revolutions per mahayuga, ≈50 arcseconds per year, close to the modern 50.3″/yr. The text is famously ambiguous about whether this is monotonic precession (the modern reading) or libratory oscillation (trepidation). Both readings have defenders in scholarship. Burgess's 1860 commentary is where the modern dispute opens.