This is quite an interesting article on timelines and history. Link to full article below.

The Yuga Cycle doctrine tells us that we are now living in the Kali Yuga; the age of darkness, when moral virtue and mental capabilities reach their lowest point in the cycle. 

“Since Egypt’s Old Kingdom, up until very recently…civilization has been going down, not up; simple as that. We can follow that degenerative process physically in Egypt; it is written into the stones and it is unmistakable. The same tale is told in the mythologies and legends of virtually all other societies and civilizations the world over…Progress does not go in a straight line from primitive ancestors to smart old us with our bobblehead dolls and weapons of mass destruction; our traffic jams and our polluted seas, skies and lands. There is another, and far more realistic, way to view history. Plato talked about a cycle of Ages: Golden, Silver, Bronze and Iron (or Dark) Age; a cycle, a wave form – not a straight line. A similar understanding is reflected by virtually all other ancient accounts. The best known, and by far the most elaborately developed of these systems, is the Hindu, with its Yuga Cycle, which corresponds to the Platonic idea of four definable Ages.”[30]

It is evident that the original Yuga Cycle was based on the Saptarsi Calendar. It was of 12,000 years duration, comprised of four Yugas of equal duration of 2,700 years each, separated by transitional periods of 300 years. The complete Yuga Cycle of 24,000 years was comprised of an ascending and descending Yuga cycle, which followed each other for eternity like the cycles of day and night. For the past 2,700 years we have been evolving through the ascending Kali Yuga, and this Yuga is coming to an end in 2025. The end of the Yuga will inevitably be followed by cataclysmic earth changes and civilization collapses, as is characteristic of the transitional periods. The Dwapara Yuga is fundamentally different from the Kali in its spiritual and material dimensions, as can be gleaned from the ancient texts. Hence, we may anticipate far-reaching changes in our environment, and possibly in our cosmic neighborhood, as we transition to this period of enhanced consciousness. The current upswing in tectonic activities and the increased incidence of extreme weather phenomena may be indicative of the fact that we are slowly entering into a period of volatile earth changes. We need to be aware of these greater cycles of time that govern human civilization, and the changes that are looming in the horizon.