KALA, the devourer of all, we are all chanting the primeval songs that were passed on by the Rishis from generation to generation

So civilisations have grown and blossomed and then faded away on our planet. We hear now of continental drifts; shifting of land masses breaking old continents and forming new ones. No one knows the history of the people who lived on land that has now been submerged under seas. Time has devoured them all. In this respect the Hindus are unique. Their memories, thoughts and traditions go back to the dawn of creation itself and the time when man first appeared on this planet. 

The Rishis heard the Vedas with the appearance of human beings on our Earth. Today the Hindus are not those people whose history may be sought to be built up on inferences drawn from ancient ruins and relics of the past. With all the ups and downs that the Hindus have faced in the then history they have gone on marching in tune with KALA, the devourer of all, still chanting the primeval songs that were passed on by the Rishis from generation to generation. The Hindu does not begin from any popularly known starting point of era such as B. C., A.D., Vikram or Shaka. 

He calculates his day from the beginning of creation itself viz. the start of Brahma's day. The universe which we call Srishti begins and lasts till the close of a Brahma's day and there is Pralaya at night. The creation restarts from the dawn of the next Brahma's day. After hundred such days of Brahma there is the Great Dissolution - Mahapralaya. After its end srishti starts again and so the cycle goes on and on.

"Those yogis know the essence of time who are aware of the fact that Brahma's day extends to a thousand Mahayugas and similar is the extent of one night of Brahma's day."

- Geeta VIII-17

The four Yugas viz. Satyayuga,Treta, Dwapar and Kaliyuga make one Mahayuga. This concept is not any hidden or secret doctrine. On the other hand, every Hindu who performs the daily Sandhya recites the following Sankalpa at the start of his worship:

"Today, the first half of the second Prahar of Brahma's Day in Vaivaswat Manvantar and Shvetvarah Kalpa in the land of Aryas in the holy Bharat-Khand of Jambudweep and the first charan of Kaliyuga, in so and so Samvatsar, Month, Paksha, Tithe, Day, I of such and such Gotra and name............"

One day of Brahma is equal to a Kalpa and 14 Manwantars make one Kalpa.

Kali 

1 x 432000 human years

Dwapar 

2 x 432000 human years

Treta 

3 x 432000 human years

Satya 

4 x 432000 human years

Total 

43.2 lakhs of years 

= one Mahayuga

One day of Brahma or 1 Kalpa, is 100 x 43.2 = 432 crores of human years.

One Manwantar is equal to 432000000/14 human years = 30.858 crores.

We are at present in the seventh Manwantar Vaivaswat after the elapse of 27 Mahayugas and in the beginning of 28th Kaliyuga of the presently running Brahma's Day. The current Kali year is 5081.

Manus change in every Manwantar and they have particular names. The manu of the presently running manwantar is Vaivaswat and the manwantar is named after him. Since one Kalpa is one day of Brahma's life there are thirty Kalpas in every month of his life which have separate names.

The late Shrimad Upendra Mohan, the great scholar, sage and savant of Bengal has said in his remarkable book "Reason, science and shastras":

"The same Yugas, the same Manus, the same Kalpas, the same Brahma constantly return through time eternal, therefore the calculation of the creation, of its age, its life and its destruction is constant in correct to the minutest fracton of the time, unlike stupid modern science which does not know what it talks and flounders on from statement to statement through a quagmire of ridiculous falsehoods. Now which is right? The changeless shastras or the ever changing science............"

The Hindus know according to the calculation of the shastras that the present age of the earth is 198 crores of years. This calculation is changeless and unchangeable - it is God's spoken word and therefore the truth which is