The advantage of using cycles is that you can trade with more confidence.W.D.Gann always stated that time is more important than price and when time and price come together there is the potential for a change of trend.
Also if you limit your trading to making entries on cycle days it substantially increases your chances of being a net winner.
Super Timing is a book about cycles and how to find them.The main cycles that we use are based on the planetary aspects that I discovered when analyzing W.D.Ganns trades.
An aspect is a term used in astrology.The 360 degrees of the circle are used and the distance around the edge of the circle is split into measurements of one degree the distances between two or more planets is called an aspect.
The important aspects.
Conjunction: Planets are at exactly the same degree or are seperated by no more than five degrees.
Square: Planets are seperated by a distance of 90 degrees.
Trine: Planets are seperated by 120 degrees.A grand trine is three planets each seperated by a
distance of 120 degrees so that they each form one point of a triangle.
Opposition: The planets are opposite each other with a 180 degree seperation.

W.D. Gann