Books recommended

Bradley, Donald. Stock Market Prediction

Larry Pesavento. Planetary harmonics of speculative markets

George Bayer. Stock & Commodity Traders (Hand-book of trend determination. Secrets of forecasting values, especially commodities, including stocks)

McWhirter Louise. Astrology and stock market forecasting

They have been written in pre-computer era and are out of print, but have much more practical value than books like Gann's "Tunnel Through the Air".
You may find them in file-exchange Internet systems. Just google a bit.

A relatively new books are "Financial astrology for 1990s" (ed. by Joan McEvers) and "Planetary Stock Trading" by Bill Meridian.