In Indian cosmology, the Day of Brahma, or kalpa, is the greatest commonly acknowledged measure of time, spanning 432 million years.
Although the cosmos undergoes recurrent renewals during this time period, it represents the final limit for the existence of the created world.
The global dissolution (pralaya) occurs at the end of the Day of Brahma, when the created cosmos is completely dissolved and reabsorbed into Vishnu.
The Day of Brahma is followed by a night of similar duration, during which the only living creature is the deity Vishnu, who sleeps on the back of his snake couch, Shesha, which floats on the cosmic ocean's surface.
When the Night of Brahma is through, a lotus emerges from Vishnu's navel, which opens to show the deity Brahma, and the cosmos starts over with the new Day of Brahma.
Two approaches may be used to split the Day of Brahma into smaller sections.
One of them splits Brahma's Day into fourteen equal ages, each of which is distinguished by the divine ruler (Manu) who governs throughout that period.
Another splits Brahma's Day into a thousand mahayugas, each with four constituent yugas (cosmic time units), each shorter than the previous.
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