According to a 2005 article by James Flanagan of Gann Global Financial entitled "Master Time Factor: W.D. Gann's Most Valuable Contribution" Gann used the "major cycles" in the various courses he published. (they are -not in order of importance- 150, 120, 100, 90, 82-84, 60, 50, 40, 30, 20, 15, & 10) Flanagan says that Gann
"accorded the 60-year cycle the most significance in stocks, referring to it as the "Great Cycle" , whereas for commodities he emphasized the 90-year cycle, giving it the designation, "Great Cycle". History shows that both of these cycles are of primary importance.". pg 5.
Flanagan says his shop references prior instances of the cycles listed to see what might be the most appropriate analog for present day analysis in terms of trend, when highs and lows occurred, and similarity of market movement in general.
Intrigued, I assembled and reviewed the data. So far 1956, which is the "60 year Great Cycle" year -- back from 2016 --, is the most similar of all the cycle references to the current market structure, even down to the double bottoms in Jan/Feb.
Below is a dialy chart of the Dow Industrials for 1956 (60 years ago). BTW, it also matches closely what the current Hurst Spectral Analysis is showing for 2016.
ATB
Geo