Beginning of universe and Concept of God-The Time Division

Table showing different division of time-Cosmic time

                                                                                                                                                     

One year of Human beings  = One day of Demi-gods.

One year of Demi-god         = 360 human years
One Manavatara                  = 72 Maha-yuga
     

        One avatar of Vishnu will occur in every 1000 years of demi-god or devas.
01 avatar of Vishnu             = 1000 years of demi-god.
                                             = 1000 X 360
                                             =360000 human years
          

                              Duration of earth time is divided in the ratio of 4:3:2:1 among the four yugas. So the above ratio is also the number of the avatar in different yugas.
One Maha-yuga          =04 yugas
Satya yuga                  = 4000 demi-god years ,04 avatar
Treta yuga                  =3600 demi-god years, 03 avatar
Dwapar yuga              =2400 demi-god years , 02 avatar
Kali yuga                    =1200 demi-god years , 01 avatar

     One Manavatara  = 72 chatur yuga or Maha yugas
                                   = 14 Manus = 01 kalpa or day & night of Brahma
At the end of each kalpa, there's a period same as Kalpa of dissolution or Pralaya.
Numbers of Vishnu avatar = 14 X 72 maha yuga X 10 avatar
                                             = 10080 times avatar will occur on earth in a day of Brahma.

A manavatara is the period during which the earth is ruled by a particular Manu, the father of the man. A new manu manifests at the beginning of each manavatara to produce a new race of human beings. Each manavantara lasts for about 72 Mahayuga.In each manavatra along with Manu appears Seven seers or rishis and one Indra. The current Manu is 7th in the line and is known as Vaivasvata Manu.

 The duration of the material universe is limited. It is manifested in the cycle of Kalpas. These four yugas, rotating a thousand times, comprise one day of Brahma, and the same number comprise one night. Brahma lives 100 such years.”These hundred years” by earth calculation equals 311 trillion and 40 billion earth years. By this calculation, the lifetime of Brahma seems fantastic and interminable, but from the viewpoint of eternity, it is as brief as a lightning flash. In the causal ocean, there are innumerable Brahma rising and disappearing like bubbles in the Atlantic. Brahma and his are all part of the material universe, and therefore they are in constant flux. In the material universe, not even Brahma is free from the process of birth, old age and death. After his tenure, Brahma gets death or dissolve in the supreme soul. Elevated sanyasis are promoted to the Brahma’s particular world-Brahmalok, which is that the highest planet or loka or world within the material universe and which survives all the heavenly planets in the upper strata of the planetary systems, but in due course, Brahma and every one the inhabitants of Brahmaloka are subject to death, consistent with the law of fabric nature. After 4320,000,000 solar years, when Brahma awoke to create again by the will of the lord, all the risis Marici, Angira , Atri etc. and so were created from the transcendental body of the lord. A day of Brahma’s life is 4320,000,000 solar years and for this same period, Brahma Ji rests in the dark in Yog-Nidra within the body of Garbhodakasayi Visnu, the generator of Brahma. Thus after the sleeping period of Brahma, when there is again creation by the will of the lord through the agency of Brahma, all the great risis again appears from the different parts of the transcendental body, and Narada also appears. This means that Narada appears in the same transcendental body, just as man awakes from sleep in the same body. Sri Narada is eternally free to move in all parts of the transcendental and material creation of the almighty. He appears and disappears in his own transcendental body, which is without distinction of body and soul, unlike conditioned beings.

 

There is two types of dissolution of the manifested cosmos. At the end of every 4,320,000,000 solar years, when the Brahma, the lord of one particular universe, goes to sleep, there is one annihilation. At the end of Lord Brahma’s life, there is the complete annihilation of the entire universe, and in both the periods, both the material energy called the Maha-tattva and the marginal energy called the Jiva-tattva merges in the supreme soul. The beings remain asleep within the body of the lord until there is another creation of the material world, and that is the way of creation, maintenance and annihilation of the material manifestation. In the first dissolution, all the lower planetary systems or lower lokas are destroyed. In the second dissolution, all the planetary systems, including the heavenly systems are dissolved and enter into the body of Garbhodakasayi Vishnu, who lives in the Garbhodaka ocean.

Lord Shiva- After the lifetime of Brahma (100 Brama years) the entire cosmos gets merged into Lord Vishnu and he goes for his Yog-Nidra. Lord Shiva dances for 100 Brahma years, destroying everything that is left. After 100 Brahma years, Lord Vishnu wakes up and start creating a new Brahma from his navel. Then Lord Shiva goes into meditation.

Lord Vishnu- He goes into Yog-Nidra after the lifetime of Brahma, he wakes up after 100 Brahma years from Yog-Nidra and creates another Brahma. Lord Vishnu and Lord Shiva, with their consorts, are eternal.

 

According to some sects age of Vishnu Ji is seven-time that of Brahma. Shiv Ji's age is seven times that of Vishnu. As there are Trinity for every universe. So these trinity merges in the Supreme soul after term.