Reckoning of time amongst the Devas.

* 1 human year = 1 day of the Devas.
* 30 days of the Devas = 1 month of the Devas. (= 30 human years)
* 12 months of the Devas = 1 year of the Devas = 1 divine year (= 360 human years)
* The lifespan of the Devas is 100 years of the Devas (= 36,000 human years)

The Vishnu Purana Time measurement section of the Vishnu Purana Book I Chapter III explains the above as follows:

* 2 Ayanas (six month periods, see above) = 1 human year or 1 day of the devas
* 4,000 + 400 + 400 = 4,800 divine years (= 1,728,000 human years) = 1 Krita Yuga
* 3,000 + 300 + 300 = 3,600 divine years (= 1,296,000 human years) = 1 Tretá Yuga
* 2,000 + 200 + 200 = 2,400 divine years (= 864,000 human years) = 1 Dwápara Yuga
* 1,000 + 100 + 100 = 1,200 divine years (= 432,000 human years) = 1 Kali Yuga
* 12,000 divine year = 4 Yugas (= 4,320,000 human years) = 1 Mahayuga (also called divine yuga)