Biorhythms (Calendar And Calculator) - HP -01 Owner's Manual

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BIORHYTHMS (Calendar and Calculator). Ever wonder why some days nothing goes right?
Check your biorhythms—it might be a critical day!
The biorhythm theory postulates that certain metabolic rhythms have a constant cycle time in
the human body, starting from birth. The first is a 23-day cycle that correlates with physical
vitality, endurance, and energy. The second cycle is 28 days and corresponds to sensitivity,
intuition, and emotion. The third is a 33-day cognitive or intellectual cycle that relates to mental
alertness and judgement.
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23 days 33 days
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Birth < LN L/
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