The sacred texts are the equivalent of entry level text books. Which means university level text books for you guys. Religion of Science and all that. The Yongle Dadian for example is a combination encyclopedia and technical manual. The Rig Veda says,
[O Sun] you who traverse 2,202 yojanas in half a nimesa.
which translates to 187945 miles per second. (Modern speed says 186000, the inconsistency is from units not converting properly due to fractions not being perfectly mappable to decimal and several intervening units.)