Speed of Light
Looks like the ancient Hindus knew the speed of light and were using the concept of light years (the distance light travels in one year) several thousand years ago. Without the aid of modern instruments, but by direct yogic perception.
“…One such book is the celebrated commentary on the Rigveda by Sayana (c. 1315-1387), a minister in the court of King Bukka of the Vijayanagar Empire in South India. In a hymn addressed to the sun, he says that it is “remembered that the sun traverses 2,202 yojanas in half a nimesha.”
This statement could either relate to the speed of the sun or to that of light. The units are well known. For example, the Indian epic “Mahabharata” … defines 1 nimesha to be equal to 16/75.3 seconds; 1 yojana is about 9 miles.
Substituting in Sayana’s statement we get 186,536 miles per second. “
Sun/Light travels 2,202 yognas in 1/2 nimisha =
= (2202 x 9 miles) x 2 in 1 nimisha
= 39636 miles in 1 nimisha
= 39636 x 75.3/16 in one second
= 186,536 miles/second = exactly the speed of light as known today