Biorhythm Calculator
Plot the triple-harmonic cycles of physical, emotional, and cognitive energy.
Sinusoidal Superposition 🖖
Biorhythms are an arbitrary summation of fixed-frequency sine waves...
Three clocks set at birth 🖖
Biorhythm theory imagines three fixed rhythms that start the day you're born and never reset. This tool simply draws them as three sine waves: a 23-day physical cycle, a 28-day emotional one, and a 33-day intellectual one. A "critical day" is just a curve crossing the zero line — pure geometry, not something your body feels. The physical curve, for example, crosses zero every 11.5 days like clockwork.
The 58-year super-cycle 🖖
Because 23, 28, and 33 share no common divisor, the three curves only snap back to their exact birth alignment after their least common multiple: 23 × 28 × 33 = 21,252 days, about 58.2 years. Until roughly your 58th birthday you never repeat the same combined state twice. It's a pure number-theory quirk — coprime periods stretch the true cycle out to the product of all three.