The Yuga Cycle & the Day and Night of Brahma Beyond the smaller cycles of time that we are all familiar with, the sacred texts and legends of our ancestors resonate with the ideas of larger cycles of time which govern the rhythmic rise and fall of civilizations over thousands of years and the evolution and extinction of life forms over geological time scales. Two of these time cycles have been spelled out in explicit detail in the ancient texts, which I have explored in my earlier articles: the “Yuga Cycle” and the “Day and Night of Brahma”.