Ten Civilizations, 5,000 Years: Empirical Identification of a 270-Year Historical Transition Cycle

This study investigates whether a 270-year historical transition cycle is empirically observable across geographically, culturally, and politically independent civilizations. We analyzed data from ten civilizations spanning approximately 10,000 years. The 270-year macro-cycle was confirmed in all ten civilizations. Monte Carlo tests (N = 100,000) reject the null hypothesis that the 270-year period arises by chance: the global test yields p < 0.0001 with Cohen's d = 5.76. A sharp error minimum at exactly 270 years confirms 270 as a distinctive rather than arbitrary value. The 270-year macro-cycle contains an internal sub-cycle structure of 90, 83, and 55 years.