[KALKI]

The Hindu and Vedic writings also make reference to four ages (Yuga) termed: Satya (Golden), Treta (Silver), Dwapara (Bronze) and Kali (Iron). According to the Laws of Manu these four ages total 4.32 million years. Kali-Yuga lasts for 432,000 years, Dvapara Yuga lasts for 864,000 years, Treta Yuga lasts for 1,296,000 years, and Satya Yuga lasts for 1,728,000 years.

These four yugas make up a Maha Yuga, a Catur Yuga, or a Divya Yuga. 1000 Maha Yugas taken together equals one day of Brahma or 4.32 billion years.

Brahma’s night is of an equal length which is also 4.32 billion years. Taken together Brahma’s day and night are 8.64 billion years in total. Brahma lives for 36,000 "Brahma days" so his lifespan is equivalent to 311 trillion, 40 billion years. After his death there is an equivalent period of 311 trillion, 40 billion years when the Universe is unmanifest.

Then a new Brahma is born and the cycle starts all over again. Taken together the life and the death of Brahma equals 622 trillion, 80 billion years. This equals one cycle out of innumerable cycles in the Vedic Universe.