Our modern history starts from roughly 20000 years earlier. Aztecs could not go beyond a mere 4000 – 5000 years. The empire of Sumerians recorded up to 250000 years. Babylon was a little further, maintaining a journal of 400000 years. Legendary Egyptians reached their limit at 100000 years. Ancient Mayans stands apart from this list, who had the concept of cyclic time and a mechanism to measure a billion year long cycle. But all of them combined, is dwarfed by enormity and complexity of the ancient Bharat almanac.