Satya-yuga:
1,728,000 human years
Treta-yuga:
1,296,000 human years
Dvapara-yuga:
864,000 human years
Kali-yuga:
432,000 human years
Vaisnava Philosophy Ages (All categories of Vaisnava Philosophy: The Roots of Existence)
Edit: more info on time
Another point illustrating the advanced nature of the Vedic Aryan civilization is their conception of the universal time scale. The time factor is calculated as affecting various levels of the universe differently. For example, a day for the demigods is equal to six months for humans on planet earth. And a year is calculated as 360 human years, while 12,000 years of the gods is said to be but one blink of the eye of Maha Vishnu. For Lord Brahma, the highest of all the demigods, his day equals one thousand cycles of the combined four ages of Satya, Treta, Dvapara, and Kali-yugas. This amounts to 4.3 billion years, at the end of which is his night when there is a partial annihilation of the universe, which includes the earth. After an equal number of years, Brahma's day begins again, and that which is destroyed is again created or revived.
In the Bhagavad Gita, Lord Krishna tells Arjuna:
" All the worlds from Brahma's world (the universe) are periodic. Arjuna. They, those who know the day and night, know that the day of Brahma is a thousand yugas long and a night is a thousand yugas long. From the unmanifested, all the manifest things spring forth on the arrival of the day (of Brahma). On the onset of night all these sink into what is called the unmanifested. Partha, (Arjuna), this multitude of created things having existed over and over again and helplessly destroyed at the onset of night, spring forth on the onset of day."
All this sounds a little like the modern theory of an oscillating universe that begins with a big bang that all matter flying out until the outrushing matter comes to a halt and collapses back into a tiny speck, leading to another big bang, and so on. An entire cycle according to present-day cosmological ideas could take 10,000million to 20,000 million years. It seems incredible that the ancient Hindus could hit upon this idea thousands of years ago. Some biased scholars have tended to dismiss this agreement of the order of length of the cycle as a mere coincidence.
"Interestingly, modern science has estimated that the age of the earth is about 4 billion years. Scholars feel it is uncanny that the Vedic Aryans could have conceived of such a vast span of time over 3,500 years ago that would be similar to the same figure estimated by science today."
(source: The Secret Teachings of the Vedas - By Stephen Knapp p. 25)
Text
1,728,000 human years
Treta-yuga:
1,296,000 human years
Dvapara-yuga:
864,000 human years
Kali-yuga:
432,000 human years
Vaisnava Philosophy Ages (All categories of Vaisnava Philosophy: The Roots of Existence)
Edit: more info on time
Another point illustrating the advanced nature of the Vedic Aryan civilization is their conception of the universal time scale. The time factor is calculated as affecting various levels of the universe differently. For example, a day for the demigods is equal to six months for humans on planet earth. And a year is calculated as 360 human years, while 12,000 years of the gods is said to be but one blink of the eye of Maha Vishnu. For Lord Brahma, the highest of all the demigods, his day equals one thousand cycles of the combined four ages of Satya, Treta, Dvapara, and Kali-yugas. This amounts to 4.3 billion years, at the end of which is his night when there is a partial annihilation of the universe, which includes the earth. After an equal number of years, Brahma's day begins again, and that which is destroyed is again created or revived.
In the Bhagavad Gita, Lord Krishna tells Arjuna:
" All the worlds from Brahma's world (the universe) are periodic. Arjuna. They, those who know the day and night, know that the day of Brahma is a thousand yugas long and a night is a thousand yugas long. From the unmanifested, all the manifest things spring forth on the arrival of the day (of Brahma). On the onset of night all these sink into what is called the unmanifested. Partha, (Arjuna), this multitude of created things having existed over and over again and helplessly destroyed at the onset of night, spring forth on the onset of day."
All this sounds a little like the modern theory of an oscillating universe that begins with a big bang that all matter flying out until the outrushing matter comes to a halt and collapses back into a tiny speck, leading to another big bang, and so on. An entire cycle according to present-day cosmological ideas could take 10,000million to 20,000 million years. It seems incredible that the ancient Hindus could hit upon this idea thousands of years ago. Some biased scholars have tended to dismiss this agreement of the order of length of the cycle as a mere coincidence.
"Interestingly, modern science has estimated that the age of the earth is about 4 billion years. Scholars feel it is uncanny that the Vedic Aryans could have conceived of such a vast span of time over 3,500 years ago that would be similar to the same figure estimated by science today."
(source: The Secret Teachings of the Vedas - By Stephen Knapp p. 25)
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