In Landscape Mode you can see even a longer range of up to 90+ days. It has a separate best and worst Days of the Year view, and in the full Version you get 5 additional curves for Intuition, Asthetics, Awareness, Spiritual and the combined Graph for all 7 curves.
See the best and worst ten Days of the selected Year.
Check how the curves are going to develop over a longer period of time.
Have your cycle directly on your wrist, no better place for a quick check.
The notion of periodic cycles in human fortunes is ancient; for instance, it is found in natal astrology and in folk beliefs about "lucky days". The 23- and 28-day rhythms used by biorhythmists, however, were first devised in the late 19th century by Wilhelm Fliess, a Berlin physician and patient of Sigmund Freud. Fliess believed that he observed regularities at 23- and 28-day intervals in a number of phenomena, including births and deaths. He labeled the 23-day rhythm "male" and the 28-day rhythm "female", matching the menstrual cycle. (Source: Wikipedia)