is the fourth epoch of the Hindu calendar.
One of the cosmic time reckonings assigns a certain age to the Earth.
Traditional thinking is that time has no origin or conclusion, but rather rotates between cycles of creation and activity, followed by halt and silence.
Each of these cycles lasts 4.32 billion years, with the Day of Brahma being the active period and the Night of Brahma being the tranquil phase.
The Day of Brahma is split into one thousand mahayugas ("great cosmic eras"), each lasting 4.32 million years, according to one accounting of cosmic chronology.
The Krta Yuga, Treta Yuga, Dvapara Yuga, and Kali Yuga are the four component yugas (units of cosmic time) that make up each mahayuga.
Each of these four yugas is shorter than the one before it, ushering in a period of greater degeneration and depravity.
Things have grown so horrible towards the conclusion of the Kali Yuga that the only remedy is to destroy and recreate the world, at which point the new Krta period starts.
The Dvapara Yuga, which lasts 864,000 years, is the third of four yugas that make up a mahayuga.
Bronze is the metal linked with the Dvapara yuga, which is less valued than gold and silver from previous eras but superior than the Kali yuga's iron.
This is widely thought to be the cosmic era when the deity Krishna first came on Earth.
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