PVAC Days and Alan's Method
PVAC is the acronym Alan uses for a four-day rotation cycle. The cycle itself is circularly continuous every days of the week, forever, including every holiday.
Thus if, for instance, Monday was a P, Tuesday is V, Wednesday is A, Thursday is C. At this point the cycle repeats, with Friday being P, Saturday being V, Sunday being A, and the following Monday being C.
One must first determine a valid and confirmed ?PVAC? day to start their cycle properly. The easiest way to do that is to apply the PVAC template, which is coded to do the repeat cycle using the Ensign internal calendar. One could also make a small calendar and color each day after a known PVAC day is determined.
Having started, the cycle never changes. While each day tends to have the
characteristics shown below, like all cycle tools, there are inversions,
which will last a cycle or at times even more, and have reasonable odds of
inverting regularly. Welles Wilder's Delta Phenomenon book is a good
resource for understanding inversion, as well as for the trader who wants to
incorporate a four-day rotation cycle into their work.