The following links claim that there is evidence of the correct speed of light in a Rig Veda Commentary:
In the hymn, the author pays respect to the one who moves 2202 yojanas in half a nimish
The metric conversions to support this are:
1 yojan = 4 kose
1 kose = 8000 British yards
1 British yard = 0.9144 m.
In the Shrimad Bhagavad:
15 nimishas = 1 kashta
15 kashtas = 1 laghu
30 laghus = 1 muhurta
30 muhurtas = 1 diva-ratri
If these conversions and the hymn are true, then the claim follows (Speed of light under these conversions and using the hymn calculated as 302031036.422 m/s, which is very accurate)
- Is the hymn by Sayana in the 13th-something century
- Are the conversions correct?