IndiaDivine.org: 
The first quantitative estimate of the speed of light is seen in Indian vedic scholar Sayana's commentary on the Rig Veda. It says that sun light travels 2,202 yojanas in the time span of a nimisharda (half a nimisha). The yojana is an ancient unit of length. Arthasastra defines it as being equal to 8,000 dhanus, which is equivalent to 9.09 miles. A nimisha is an ancient unit of time that is equal to 16/75 seconds. Thus 2,202 yojanas in half a nimisha is equal to 189,547 miles per second after conversion. The modern estimate of the speed of light is 186,281.7 miles per second.
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