According to Hindu philosophy Yuga ( युग ) is a name of an era within a four age cycle. As per Hindu Cosmology life in the universe is created and destroyed once every 4.1 to 8.2 billion years which is one full day (Day & Night of Bramha). The cycles are said to repeat like the seasons. According to the Laws of Manu, one of the earliest known texts describing the yugas, the length is 4800 years + 3600 years + 2400 years + 1200 years for a total of 12,000 years for one arc, or 24,000 years to complete the cycle (one precession of the equinox). However, the more recent and popular interpretation from the Srimad Bhagavatam states the following: "The duration of the Satya millennium equals 4,800 years of the years of the demigods; the duration of the Dvāpara millennium equals 2,400 years; and that of the Kali millennium is 1,200 years of the demigods... As aforementioned, one year of the demigods is equal to 360 years of the human beings. The duration of the Satya-yuga is therefore 4,800 x 360, or 1,728,000 years. The duration of the Tretā-yuga is 3,600 x 360, or 1,296,000 years. The duration of the Dvāpara-yuga is 2,400 x 360, or 864,000 years. And the last, the Kali-yuga, is 1,200 x 360, or 432,000 years in total." (Śrīmad Bhāgavatam 3.11.19). These 4 yugas follow a timeline ratio of (4:3:2:1). The ages see a gradual decline of dharma, wisdom, knowledge, intellectual capability, life span, emotional and physical strength.The value of 24,000 years is within 7% of the modern astronomical calculation of one full precession of the equinox of 25,772 years.
Precession of the Equinox : Precession is a change in the orientation of the rotational axis of a rotating body. An equinox occurs twice a year (around 20 March and 22 September), when the plane of the Earth's equator passes the center of the Sun . At this time the tilt of the Earth's axis is inclined neither away from nor towards the Sun. The Earth's axis completes one full cycle of precession every 25,772 years . In addition, the angle between Earth's rotational axis and the normal to the plane of its orbit (obliquity) oscillates between 22.1 and 24.5 degrees on a 41,000-year cycle. It is currently 23.44 degrees and decreasing.(For more information about Please refer http://en.wikipedia.org/wiki/Precession & http://en.wikipedia.org/wiki/Milankovitch_cycle.
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