When wave is down, we are more likely to be depressed, irritable, moody or bad tempered. The Intellectual wave is a cycle of 33 days. The Intellectual cycle has more effect over how smart we feel. When our Intellectual cycle is up, we are more likely to remember things better, do better on tests, and solve problems more quickly and effectively. When the cycle is down, we are more likely to have problems concentrating and make decisions of questionable merit.
Critical times are when the wave cross from negative levels to positive and positive to negative.
On a graph that would be zero. Thus in every complete cycle, we cross zero twice. Once on the up swing and once on the down swing. On the days where we cross the zero line our system is more likely to be in chaos. There is more chance that things will go wrong and we are more likely to have an accident.