Shloka: Kasthah pancadasakhyata nimesa munisattama |
Kasthastrimsat kala tastu trimsanmauhurtiko vidhih ||
Tavatsankhyairahoratram muhutairmanusam smrtam |
Ahorstrani tavanti masah paksadvayatmakah ||
Taih sadbhirayanam varsam dvayesyane daksinottare |
Divyairvarsasahasraistu krtatretadisamjnitam ||
Caturyugam dvadasabjistadvibhagam nibodha me |
Divyabdanam sahasrani yugesvahu puravidah ||
Krtam treat dvaparam ca kaliscaiva caturyugam |
Procyate tat sahasranca brahmano divas am mune ||
15 twinkles of eye = 1 kashta
30 Kashta = 1 Kala
30 Kalas = 1 muhurtha
30 muhurthas = 1 day and night
30 day and nights = 1 month
6 months = 1 ayana
2 ayanas = 1 year
12,000 divine years = 4 Yugas Krita, treta, dvapara and kali.
= 1 day of Bramha
Source: Vishnu puranam, Book 1, Chapter 3, shloka 8-11 and 15 (post Vedic period)
1 divine year = 360 human years
12,000 divine years = 43,20,000 human years = 1 day of Bramha the creator of Universe.
According to Vedic theory our universe is compared to Bramha the creator. And age of Bramha is equal to age of our universe. It was believed that Bramha lived for 100 years and after that a new Bramha is born. This period of hundred years was called as Divya Varsh or god years. They say that one year of Bramha consists of 360 days. So one day of Bramha was known as Kalpa. Day has 14 Manvantaras and similarly night also has 14 Manvantaras. There are 71 Mahayugas in each Manvantaras.
Mahayuga is also known as Chaturyuga which is a collection of four yugas. These four Yugas are Krita Yuga (Satya Yuga), Treta Yuga, Dvapara Yuga and Kali Yuga. At present we are living in the last Mahayuga i.e. the Kali Yuga.
Satya Yuga was said to be the divine period where there was no physical existence of humans. This Yuga lasts for 40% of Mahayuga.
Treta Yuga was said to be a Yuga were in bad deeds started appearing but still truth was the majority. Infact 3/4 of goodliness still existed. Treta Yuga lasts for 30% of Mahayuga.
Dvapara Yuga was said to have equal good and bad deeds. And it lasted for about 20% of Mahayuga.
Kali Yuga was said to have majority of bad deeds and there is very less truth remaining. Kali means darkness in Sanskrit.
The chaukri Yugas has the following
Satya Yuga = 1728000 years
Treta Yuga = 1296000 years
Dvapara Yuga = 864000 years
Kali Yuga = 432000 years
Let us see what the age of our Universe is.
1 Mahayuga = 4,320,000 years
1 Manvantara = 71 Mahayugas
1 day of Bramha = 14 Manvantaras + (15 x 4) Yugas
= 994 + 6 Mahayugas = 1000 Mahayugas
Hence 1 day of Bramha = 1000 Mahayuga = 4,320,000,000 years
Similarly 1 night of Bramha = 1000 Mahayugas = 4,320,000,000 years
So 1 complete day is equal to 8,640,000,000 years = 8.64 billion years
This is the Vedic reference to age of our Universe. There is Modern reference for this too.
According to the western reference Big bang is the biggest budget ever with mind-boggling number to amaze us. The 5th century cosmologists first estimated the age of earth to be more than 4 billion years.