I wanted to write about Pralayams, but realized that it cannot be understood fully without first knowing the Units of measurements of time described in Vishnu Puranam.
According to Parasarar in Vishnu Puranam,
Fifteen twinklings of the eye make a Kásht́há; thirty Kásht́hás, one Kalá; and thirty Kalás, one Muhúrta. Thirty Muhúrtas make our one day (a day and night of mortals). 30 such days make a month and 12 such months make a year (360 days a year, only). One mortal year is divided into 2 parts or Ayanas, Uttarayana and Dakshinayana.
Let us now see how a mortal year translates to a divine year.
1 Uttarayana or the northern movement of the Sun in the celestial sphere is a day of the Gods and Dakshinayana or the Southern movement of the Sun, a night for them. This means that 1 year in our life is 1 divine day for the Gods. There are 360 divine days in one divine year.
12,000 divine years constitute the 4 Yugas – Krita, Treta, Dwapara and Kali and 4 Yugas make one Chathur Yuga. There are 1000 Chathur Yugas in a day-time of Brahma.
Let me stop with that for now- too many numbers to crunch and too much information to digest and remember from one post. In the next post, we will see about what constitutes a day for Brahma, how the 12000 divine years are spread across the 4 Yugas, and how Brahma administers the 4 Yugas.