Purans' calculations of period and time correspond to modern scientists' experiments and observations.

In fact, Shrimad Bhagwad Geeta provides a great liftoff for understanding the antiquity of the world and the universe.

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The Srimad Bhagavad Purana tells the account of King Muchukunda and Sri Krishna.

1 day of heaven is equivalent to 1 earth year, so the duration of Satyayuga is 4,800 x 360, or 1,728,000 years. The duration of the Tretayuga is 3,600 x 360, or 1,296,000 years. The duration of the Dwaparyuga is 2,400 x 360, or 864,000 years.

Several Yogis (or monks) who followed Vedic ideals departed their bodies to wandering through space during Samadhi, never to return for hundreds of years, have been discovered.

For materialistic beings like ourselves, it may seem strange, yet it is entirely plausible that humans existed who might stay alive indefinitely if they were in deep meditation or heavenly sleep.