In his commentary on the Vedas, Sayana mentions the speed of light. Sayana was a 14 th century commentator on the Vedas. He lived in the Vijayanagar Empire. Speed of light as mentioned in Rig Veda commentary (RV 1.50.4). "[O Sun,] bow to you, you who traverse 2,202 yojanas in half a nimesha.". "tatha ca smaryate yojananam. sahasre dve dve sate dve ca yojane ekena nimishardhena kramaman" " तथा च स्मर्यते योजनानां सहस्त्रं द्वे द्वे शते द्वे च योजने एकेन निमिषार्धेन क्रममाण नमोऽस्तुते॥ " More information on this subject can be found in this article in the Wikipedia. Information shared by Abhishek Chandan