Yuga

A name denoting a unit of cosmic time,
with two possible meanings. According
to traditional belief, time has neither
beginning nor end, but alternates
between cycles of creation and activity,
followed by cessation and quietude.
Each of these cycles lasts for 4.32 billion
years, with the active phase known as
the Day of Brahma, and the quiet phase
the Night of Brahma. In cosmic time,
the Day of Brahma is divided into one
thousand mahayugas (“great cosmic
ages”), each of which lasts for 4.32
million years, and this is one possible
meaning of the word yuga. The more
common use is to refer to a mahayuga’s
four constituent yugas, named the Krta
Yuga, Treta Yuga, Dvapara Yuga, and
Kali Yuga.
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Yuga