HP -01 Owner's Manual page 72

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Applications
70
Days whenthe cycle crosses the median line are called "critical days," especially for the physical
and sensitivity cycles. To calculate your critical days:
Recall today's date, subtract your birthdate, and store the result in .
Divide the number of days in ) by 23 (physical cycle).
Divide the number of days in @) by 28 (sensitivity cycle).
Divide the number of days in @ by 33 (intellectual cycle).
In steps 2, 3, and 4, look at the fractional part of each answer—i.e., disregard the integer digits
to the left of the decimal point and use only the digits to the right. A fractional value of zero
(not displayed) or between .47 up to and including .50 indicates a critical day for that cycle.
Example:
Lucky Pierre, at the age of 212, decides to seek his fortune. He was born on
April 15, 1955, and decides to use his HP-01 to calculate his biorhythm cycles. He recalls the
present date (October 15, 1976) and proceeds as follows:

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