Maya timekeepers developed a fractal or quantum concept of time in which the heavens and man and all the world danced to the same drummer. Cosmologically speaking, the basic unit of measure was the 360 day Ha'ab from the solar cycle. Since the Maya counting system is based on 20 (instead of our 10), 20 Ha'ab cycles made a Tun, 20 X 20 Tun made a made a Baktun. 13 Baktun made a Long Count, and 5 Long Counts made the greatest cycle in the series. This is how the ancient Maya scored the tick of the cosmic clock, and how they lived their lives.
We are now in the 5th Long Count, which began at sunrise on August 13, 3114 BC, and coincides with the dawn of the Maya world, according to their creation myth. Specifically, we are in the last Tun in the 13th Baktun of the 5th Long Count. All of these cycles culminate (along with the then current Ha'ab cycle) on the winter solstice at sunrise, December 21st, 2112.
That sunrise is the only one of the previous 1,872,000 sunrises when the rising sun precisely eclipses the black hole at center of the Milky Way. As the rising sun emerges from the cosmic womb, a new Ha'ab, Tun, Baktun, and a new Long Count begin as well as a new grandest cycle begin.
The ancient Maya knew that this would happen, and when, and that we would be able to see it. In aligning all their calendars to this moment they sought to send us a message. That message is that we, and we alone, live in a time when nothing will ever be the same again. That we would preside over that change, and that, as humans, we hold the balance in the universe. What we do will determine whether that change is for the better, or not.