The corpus, every claim citable.

Aryabhatiya I.5 (Dasagitika, 499 CE) gives Earth's diameter as 1,050 yojanas. The yojana is an Indian unit of distance whose conversion to modern units is disputed in Sanskrit-scholarship (estimates 5-8 miles, depending on text and period). With the most-cited mid-period value of ~7.5 miles per yojana, 1,050 yojanas = 7,875 miles — within 0.5% of the modern measurement of 7,917 miles. The Sun, Moon, and planet diameters in the same verse (in ratios to Earth's) are similarly close.

The Aryabhatiya of Aryabhata · tr. W. E. Clark, 1930