In the 1920s this became the first basic technique he taught his students: watch anniversary dates (360 solar degrees) with past market tops and bottoms for a change in trend. Gann also devised systems of counting off time in solar degrees from past market tops and bottoms in divisions of the year in halves, quarters, eighths and thirds (180, 90, 45 and 120 solar degrees). When clusters of time counts from past tops and bottoms highlighted a future date, that date was significant for a reversal of trend. Gann favored also numbers such 30, 45, 60, 90 etc. and square-numbers as 49, 144 and 216.
In 1909 he made his his famous and well documented wheat-call (HERE). He said, that if by the end of the trading day of September 29th 1909, September wheat would not reach 1.20 $, then it would prove that there was something wrong with his method. On January 13,1909 wheat made a low at 930 $, on April 13 it reached a high at 1094 and reversed again into July 14 - both times 90 solar degrees apart. More info HERE & HERE & HERE
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