Vedic Calculation on Speed of Light

Source: http://veda.sakthifoundation.org/

A common phrase called “Nimisharda” which is used in Indian languages of sanskrit origin while
referring to something that happens/moves instantly, similar to the ‘blink of an eye’. Nimisharda means half a nimesa.

In ancient sanskrit ‘Nimisha’ means ‘blink of an eye’ and that Nimisharda is used to represent how far light travels in half of the blink of an eye i.e. ‘within the blink of an eye’ .The fourth verse of the Rigvedic hymn 1:50 (50th hymn in book 1 of rigveda) is as follows:

taraNir vishvadarshato jyotishkrdasi surya vishvamaa bhaasirochanam

meaning “Swift and all beautiful art thou, O Surya (Surya=Sun), maker of the light, Illuming all the radiant realm.”

Commenting on this verse in his Rigvedic commentary, Sayana who was a minister in the court of Bukka of the great Vijayanagar Empire in South India (in early 14th century) says:

tatha ca smaryate yojananam. sahasre dve dve sate dve ca yojane ekena nimishardhena kramaman.

which means “It is remembered here that Sun (light) traverses 2,202 yojanas in half a nimisha”

NOTE: Nimisharda= half of a nimisha and Yojana is a unit of distance and Nimisha is a unit of time.

Unit of Time: Nimesa
The Moksha dharma parva of Shanti Parva in Mahabharata describes Nimisha as follows

15 Nimisha = 1 Kastha
30 Kashta = 1 Kala
30.3 Kala = 1 Muhurta
30 Muhurtas = 1 Diva-Ratri (Day-Night)

We know Day-Night is 24 hours
So we get 24 hours = 30 x 30.3 x 30 x 15 nimisha

in other words 409050 nimisha
We know 1 hour = 60 x 60 = 3600 seconds

So 24 hours = 24 x 3600 seconds = 409050 nimisha
409050 nimesa = 86,400 seconds

1 nimesa = 0.2112 seconds (This is a recursive decimal! Wink of an eye=.2112 seconds!)
1/2 nimesa = 0.1056 seconds

Unit of Distance: Yojana

Yojana is defined in Chapter 6 of Book 1 of the ancient vedic text “Vishnu Purana” as follows

10 Paramáńus = 1 Parasúkshma
10 Parasúkshmas = 1 Trasareńu
10 Trasareńus = 1 Mahírajas (particle of dust)
10 Mahírajasas = 1 Bálágra (hair’s point)
10 Bálágras = 1 Likhyá
10 Likhyás= 1 Yúka
1o Yúkas = 1 Yavodara (heart of barley)
10 Yavodaras = 1 Yava (barley grain of middle size)
10 Yava = 1 Angula (finger, or inch)
6 fingers = 1 Pada (the breadth of it)
2 Padas = 1 Vitasti (span)
2 Vitasti = 1 Hasta (cubit)
4 Hastas = a Dhanu, a Danda, or pauruSa (a man’s height), or 2 Nárikás = 6 feet
2000 Dhanus = 1 Gavyúti (distance to which a cow’s call or lowing can be heard) = 12000 feet
4 Gavyútis = 1 Yojana = 9.09 miles

Calculation:
So now we can calculate what is the value of the speed of light in modern units based on the value given as 2202 yojanas in 1/2 nimesa
= 2202 x 9.09 miles per 0.1056 seconds
= 20016.18 miles per 0.1056 seconds
= 189547 miles per second !!
As per the modern science speed of light is 186000 miles per second !