The three cycles
The emotional cycle runs 28 days, exactly four weeks, so each of its states always falls on the same weekday for a given person. The theory says it governs confidence, mood, sensitivity and creativity.
28days
The theory gives the emotional cycle confidence, mood, feeling, creativity and the way we react to other people: the high phase as warm and outgoing, the low phase as quieter and more inward, the critical days as days when reactions run strong. Because the cycle is exactly four weeks long, the theory's own arithmetic makes every emotional critical day fall on the same day of the week for the whole of a person's life.
The emotional cycle begins on the day you were born and repeats every 28 days. To find where it sits on any date, count the days since your birth, divide by 28, and the remainder is the day of the cycle; the day you were born is day 1. That is the whole calculation, and it is the same for everyone.
Step by step, with a worked example: How to calculate a biorhythm.
Eight states
The symbols and their meanings are explained on How to read a biorhythm chart.
Day 1
Critical, turning up
Days 15–16
Critical, turning down
Day 1, when the cycle begins and rises through its midline, and the day about half-way through, when it falls below it. The theory reads both as unsettled rather than bad: days to notice how you feel. Critical days, explained.
BioCalendar
In BioCalendar the emotional cycle is drawn in rose. The compare view on family plans is often about this cycle: whether two people's emotional states sit on the same side of the midline on a given day. The app shows the agreement as a fact about the arithmetic, never as a verdict about the relationship.
The record
Studies that looked for this cycle in the things it is said to govern did not find it. We set out the research on Are biorhythms real?, and we ask you to read the cycle the way BioCalendar presents it: as a counted pattern, and a prompt to notice the day, not a forecast.
