Many very successful, full time traders watch the lunar cycle and base their indices calculations on it. Larry Williams first pointed it out to me. I was so impressed with his observations that I started doing my own research. If you want to know the truth about the moon and stock trading, I suggest you do your own research as well. The 20 day moving average became popular as a result of it. Richard Donchian's 5 and 20 day moving average trading system was based on it. That system still works today. It's simple, crude, and it's not optimized but, it is profitable. http://www.stockdisciplines.com/best-sell-strategy Interestingly enough, the lunar cycle occurs approximately every 20 days so, 1/2 the lunar cycle is approximately 10 days and the 10 and 20 day moving average system worked the best in the research performed at the link I posted above.
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