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APPENDIX: TIMING THE AGES
In calculating the duration of the different yugas, there is some discrepancy between the Puranas. The Brahmanda Purana (22.214.171.124-34) specifically states that Satya-yuga is 1,440,000 human years in length, Treta-yuga is 1,080,000 years, Dvapara-yuga is 720,000 years, and Kali-yuga is 360,000 years in length. The Linga Purana (4.24-35) also agrees with this except for Treta-yuga, which it says is 1,800,000 years in length. However, when explaining the various measurements of time, the Vishnu Purana (Book One, Chapter Three) and the Srimad-Bhagavatam (3.11.19), along with the Bhagavad-gita (8.17) and the Vayu Purana (Chapter 57) all agree on the measurements of the durations of the YUga. In the explanations of the measurements of time, one cycle of the four yugas together is 12,000 years of the demigods, called divine years. Each of these years is composed of 360 days, and each of their days is equal to one human year. So Krita-yuga is 4000 divine years in length, Treta-yuga is 3000 divine years in length, Dvapara-yuga is 2000 divine years in length, and Kali-yuga is 1000 divine years long.
Furthermore, each yuga is preceded by a period called a Sandhya, which is as many hundred years in length as there are thousands of years in that particular yuga. Each yuga is also followed by a period of time known as a Sandhyansa, which is also as many hundreds of years in length as there are thousands of years in the yuga. In between these periods of time is the actual yuga. Therefore, we have:
Krita-yuga = 4000 divine years, Sandhya = 400 divine years, Sandhyansa = 400 divine years. Total = 4800 divine years x 360 days = 1,728,000 human years.
Treta-yuga = 3000 divine years, Sandhya = 300 divine years, Sandhyansa = 300 divine years. Total = 3600 divine years x 360 days = 1,296,000 human years.
Dvapara-yuga = 2000 divine years, Sandhya = 200 divine years, Sandhyansa = 200 divine years. Total = 2400 divine years x 360 days = 864,000 human years.
Kali-yuga = 1000 divine years, Sandhya =100 divine years, Sandhyansa = 100 divine years. Total = 1200 divine years x 360 days = 432,000 human years.
This equals 4,320,000 human years in one cycle of the four yugas together, and 1000 cycles of these yugas equals 4,320,000,000 human years in a day of Brahma.