Fortune Biorhythms

Recently I've found yet another online biorhythm calculator at freebiorhythms.net. However it looks interesting enough because of very uncommon rhythm called fortune biorhythm. I've never heard about this rhythm before and ... why this sinusoid with 23-day period looks like usual physical biorhythm shifted on several days?

Here goes a description from website:
Biorhythms have nothing to do with stars or the supernatural; they are simply cycles of human abilities. You have probably noticed that you do not have the same physical, intellectual, emotional or intuitive abilities each day, and that your degree of "good fortune" varies considerably also.

Once you have excluded other factors, you may notice that your abilities tend to cycle, in other words, they go up and down at fixed intervals. As a result, you have certain times when you are at your peak in one or more areas and of course other times when you are at your lowest ebb.
The science behind biorhythms dates back to the late 19th Century, the era of Sigmund Feud, when various psychologists, professors and scientists studied mental and physical states and discovered that these states appeared to be governed by cycles of 23, 28 and 33 days. There is a lot of material on the internet about how biorhythms affect people, even to the claimed degree of influencing the gender of an unborn child.

You may be wondering how we are able to calculate the "fortune" biorhythm, when the degree of good or bad fortune we experiences is seemingly random and beyond our control. However, there is significant research on this subject which indicates that to some degree we are able to make our own luck, purely by our mental state. When we have a pessimistic outlook, we fail to notice the good things in life and are likely to overlook opportunities and "lucky chances" that are all around us.

However, if we have an optimistic outlook, we are more likely to turn ordinary situations into opportunities to better our lives and ourselves. Our fortune biorhythm should help you to understand when you are more likely to attract positive situations into your life.
We also offer a unique user-adjustable biorhythm, which allows you to experiment with and develop your own biorhythm sine wave based on your own findings. For instance, you may notice differences in your sexual desire and energy which are cyclical.

Good luck with new fortune biorhythm cycle!