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See your physical, emotional, and intellectual biorhythm cycles from your birth date.
Biorhythm theory proposes three fixed-length sine wave cycles — physical (23 days), emotional (28 days), and intellectual (33 days) — that begin at birth and influence daily performance and well-being.
Formula
Biorhythm = sin(2π × D / C) × 100, where D = days since birth, C = cycle lengthD = Number of days from birth date to target date
C = Cycle length: 23 (physical), 28 (emotional), or 33 (intellectual)
Worked Example
Biorhythm on day 100 after birth
Did you know? Biorhythm theory became a pop-culture phenomenon in the 1970s. Japan even tested it for accident prevention in transportation, but controlled studies found no correlation between biorhythm critical days and accident rates (source: Psychological Reports, 1978).
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