This is a simple technique that anyone can use. The planets when viewed from earth will at certain times appear to go backwards. This means that they will cover the same degree of the circle going forward (direct) and backwards (retrograde) and then direct again.
To use this in trading have a look at the degree of a planets position when a major swing high or low is made and then expect a reversal of trend when the planet again crosses this degree.
An example using Saturn retrograde / direct on the S+P.
Saturn was at 45.25 degrees while retrograde on October 18th 1999
which was a low. The next time that Saturn crossed this exact degree while direct was on the 28-29th of March 2000 with the actual high being on friday the 24th of March giving us three trading days from the top.
Another example of retrograde / direct cycles for longer term forecasts.
Is seen in the chart of the British pound.
At point 1 Uranus is at 315.91 degrees while retrograde. At point 2
Uranus is again at 315.91 degrees while direct.
W.D. Gann