Speed of Light - Rigveda

ऋग्वेद 1-50-4 ( सायणाचार्य)

तथा च स्मर्यते-योजनाना सहस्ट्रे द्वे-द्वे शते द्वे च योजने |
एकेनं निमशारधेन क्रम मान नामोस्तुटे

( above is typed on quillpad and could not be exact due to transciption limitation)

Rigved 1-50-4 ( saynachaary)

Tatha ch smryate-yojnana sahastre dwe-dwe shate dwe ch yojne |
ekenn nimshaardhen kram maan namostute

Meaning ( as given by Dr. Vartak in Vastav Ramayan)

Sun light travels 2202 yojane ( unit of length) in half nimish ( unit of time )

1 yojan = 9 & 1/16 ( 9.0625 ) miles ( as given in Govt. of India published booklet)

1 nimish = 16/75 second (0.213333..) ( support Mahbharat Shantiparva adyay 231 )

i.e in 0.10666 seconds light travels 2202 yojant ( i.e. 19955.625 miles)

therefore in 1 second light travels 187083.99 miles

which is close to moder value of spped of light ( 187372 mile per second )

This is given by sayancharya saying he is reiterating what is written in some ancient scipture..

( Above information in book Vastav Ramayan of Dr. P. V. Vartak )