Srimad Bhagavad Gita -Ramanujacharya 267

Srimad Bhagavad Gita -Ramanujacharya

Chapter-8 Tāraka Brahma Yogaḥ

sahasra-yuga-paryantam aharyad brahmaṇo viduḥ | rātriṃ yuga sahasrāntāṃ te’horātra-vido janāḥ || 17 || 17. Those who know the duration of the [Cosmic] day and night understand a day of Brahma to last for a thousand Yugas and a night of Brahma to last for another thousand Yugas. Commentary Those who know the Divinely established order of Cosmic Time which affects all beings from humankind to Lord Brahma, understand that Lord Brahma’s day is comprised of a unit period of one thousand four Yuga cycles and a night is a unit of equal duration. Chatur Yuga Tetrad of Ages Kali Yuga 432,000 human years Dvāpara Yuga 864,000 human years Treta Yuga 1,296,000 human years Krta Yuga 1,728,000 human years 1 tetrad of Yugas = 1 Mahā Yuga = 4,320,000 human years. 71 Mahā Yugas = 1 Manvantara = 308,448,000 human years 14 Manvantaras = 1 Kalpa = 4,320,000,000 human years 2 Kalpas = one day and night of Brahma = 8,640,000,000 human years 360 Brahma days = 1 Brahma year = 3,110,400,000,000 human years 100 such years = 1 lifetime of Brahma = 311,040,000,000,000 human years