William D. Gann was a legendary stock trader, whose record for accuracy was also legendary. Wyckoff tested his results, and claimed he nailed around 93% of his trades. A 33 degree Mason, Gann used a lot of very complex tools for his forecasts, including Eastern based cosmology. I have used his Gann Fans and Square of nine tools, and they have been helpful.

From his astrology, Gann produced a long term calendar, and indicated that the year 2025 would be a key pivatol year to the downside. Waiting to see if this happens.