hhhhBitcoin all time history indexINDEX:BTCUSDAtaman184 year btc cycle. Gann cycles are a technical analysis concept, popularized by W.D. Gann, which asserts that financial markets move in predictable, cyclical patterns that can be forecast by studying time and price relationships, rather than just price alone. Gann believed that the future is a repetition of the past and that markets are governed by natural, time-based cycles, such as 7, 10, 13, or 20-year cycles, which can be applied to predict future turning points and price reversals