Biorhythm

Basic Rhythm Details:

• Physical cycle (23 days; Circavigintan)
o coordination
o strength
o well-being

• Emotional cycle (28 days; Circatrigintan)
o creativity
o sensitivity
o mood
o perception
o awareness

• Intellectual cycle (33 days; Circatrigintan)
o alertness
o analytical functioning
o logical analysis
o memory or recall
o communication

Basic rhythms follow certain facets of physiological cycles, though they may include others, and the details may vary depending on the source. The three classical cycles of biorhythms are endogenous infradian rhythms. The theory's basis lies in physiological and emotional cycles. They are often represented graphically as either symmetric or asymmetric waveforms, though most theories rely on symmetric forms. The most commonly used form is the sinusoidal waveform, which is thought to be a plausible representation of a bioelectric activity cycle. Due to this sinusoidal nature, the cyclical flow of bioelectric activity undergoes periodic reverses in direction. Each cycle oscillates between a positive phase [0 percent..100 percent] and a negative phase [-100 percent..0 percent], during which bioelectric activity strengthens and weakens. The waveforms start, in most theories, at the neutral baseline (0 percent) at the time of birth of each individual. Each day that the waveform again crosses this baseline is dubbed a critical day, which means that tasks in the domain of the cycle are supposed to be far more difficult to carry out successfully than on other non-critical days. The purpose of mapping the biorhythmic cycles is to enable the calculation of critical days for performing or avoiding various activities.
The classical definition (derivatives of the original theory exist) states that one's birth is an unfavorable circumstantial event, as is the day about 58 years later when the three cycles are again synchronised at their minimum values. According to the classical definition, the theory is assumed to apply only to humans. In the classical theory, the value of each cycle can be calculated at any given time in the life of an individual, and there are web sites that do exactly that.

Calculation

It is possible to calculate one's biorhythm using one's birthdate. These calculations will result in a graph showing three curves, each representing one of the three cycles. It is advised to do these calculations in a spreadsheet such as the well-known Excel, as they are quite complicated and numerous, especially if you want to calculate your personal cycles for an entire month or even an entire year. Please note that there are more accurate methods involving one's exact hour of birth (assuming the Biorhythm theory is correct).
Here is how to calculate your three cycles' flow:

• Take the current year and subtract 1900 (e.g. 2006 - 1900 = 106). This number is further referred to as the present year. Please note that if you wish to calculate the three cycles of a month in another year, you should work with that year and not the current one.
• Take your birth year and subtract 1900 (e.g. 1976 - 1900 = 76). This number is further referred to as your birth year.
• Take the number representing the current month (e.g. 1 for January). If this number is smaller than 3, then add 10 to the number representing the current month. If this is not the case, subtract 2 from the number representing the current month (e.g. 1 represents January. 1 is smaller than 3, thus we add 10 to 1, which results in 11). This number is further referred to as the number representing the current month. Please note that if you wish to calculate the three cycles of another month, you should work with that month and not the current one.
• Take the present year and subtract 1 if the number representing the current month is smaller than 3. Otherwise, do nothing (e.g. the number representing the current month is 2 and the present year is 106. 2 is smaller than 3, so we subtract 1 from 106, which gives us a new present year of 105). We call the resulting number the present year from now on.
• Now we will calculate the first number, which is done like this: multiply the number of the present year by 365. Add the result of multiplying the number representing the current month by 28. Add the result of multiplying the number representing the current month by 2,59. Subtract 2. Add the result of dividing the number representing the current month by 4. Subtract the result of dividing the number representing the current month by 100. Add the current day, further referred to as the current day. The result of this long formula is called, as previously mentioned, the first number. Note that after every step in calculating the first number, the result ought to be rounded (towards the floor if the 10ths are smaller than 5 and towards the ceiling if otherwise).
• Take the number representing your month of birth (e.g. 3). If this number is smaller than 3, then add 10 to the number representing the current month. If this is not the case, subtract 2 from the number representing the current month (e.g. 3 represents March. 3 is equal to, but not smaller than, 3 thus we subtract 2 from 3, which results in 1). This number is furhter referred to as the number representing your month of birth.
• Take your birth year and subtract 1 if the number representing your month of birth is smaller than 3. Otherwise, do nothing (e.g. the number representing your month of birth is 1 and your birth year is 76. 1 is smaller than 3, so we subtract 1 from 76, which gives us a new your birth year of 75). We call the resulting number the present year from now on.
• We will now calculate the second number, which is done like this: multiply your birth year by 365. Add the result of multiplying the number representing your month of birth by 28. Add the result of multyplying the number representing your month of birth by 2,59. Subtract 2. Add the result of dividingyour birth year by 4. Add the result of dividingyour birth year by 400. Subtract the result of deviding your birth year by 100. Add your day of birth, further referred to as your day of birth. Note that after every step in calculating the second number, the result ought to be rounded (towards the floor if the 10ths are smaller than 5 and towards the ceiling if otherwise).
• Subtract the second number from the first number. The result will be referred to as the third number.
• With the third number, we can finally calculate the status of every cycle for every day of the month. o For the physical cycle, multiply 2 with pi. Multiply this with the result of adding the third number to the current day of the month and subtracting 1. Divide this by 23. The sine of the result of that is the number representing the state of the physical cycle of whichever current day of the month you chose.
o For the emotional cycle, do the same as for the physical cycle with the only difference being you should divide by 28 and not 23 like for the physical cycle.
o For the intellectual cycle, do the same as for the physical cycle, with the only difference being you should divide by 33 and not 23 like for the physical cycle.

You now know what the status of every of the three cycles is for whichever day of whichever month you chose. Generally, a 1 (100 percent) means the status of that cycle is being at high level, whilst -1 (-100 percent) means that the status of that cycle is at a low level. 0 (0 percent) means that the status of that cycle is at an average level. When taking your results into account in the daily life, please keep in mind that the science dealing with Biorhythms is not (yet) an established science, being marked as a protoscience and/or pseudoscience.
While the above method is correct, a simpler version exists, more suited towards computers and programming to speed up the process of calculating a persons biorhytms.

• Calculate the number of days the person has been alive (including leap days)
• Divide that number by the cycle length you require (23,28 or 33). This will give you the number of cycles the person has lived through so far.
• Remove the integer leaving you with just a fraction (i.e 234.874 becomes 0.874). This is how far into the current cycle the person is.
• Convert this number to degrees by multiplying it by 360
• The sin of the number above is equivalent to that persons biorhythm for that particular day.
o Please note, to calculate for a different day, just work out the number of days between birth and the date.
o Some programming languages require the sin argument to be in radians rather than degrees, check beforehand.

Related terminology

Biorhythmics is either a protoscientific branch or a pseudoscience, depending on opinion, that studies biorhythms or deal with biorhythms. Biorhythmic study focuses on physiological, emotional, and intellectual processes and its forecasting. Biorhythm phenomena are observable human conditions which can be detailed and explained by biorhythmics. These conditions are bound by the variables that exist in the body. Certain facets of biorhythmics are likened by proponents to concepts found in weather forecasting (commonly known as meteorology). Chronobiology is a branch of biology that studies rhythms in living beings. Unlike biorhythm, its status as a science is unquestioned.

Plausibility

Proponents of biorhythmics call it an established interdisciplinary area of scientific endeavor, which is still speculative in many facets. Critics state that biorhythms are based upon only numerological associations and elementary math. Biorhythmics' plausibility is contested by various mathematicians, some biologists and other scientists.
Biorhythms have echoes of chronobiology, the study of circadian and other rhythms. Through medical research, doctors have found that there are periodicity and rhythms during a person's lifespan, although few doctors believe they correspond to those described as "biorhythms". Biochronometry has shown that rhythm and cycles such as the circadian (from the Latin circa diem; literally, "about a day") exist. These discoveries, among others, have shown that people are affected by physiological, emotional and intellectual rhythms (though the exact relationships to the biorhythm cycles are not precisely understood). Studies in this (some say, self-described) protoscience are still being done regarding the effects of biorhythm on the human condition.
The Biorhythm theory is often treated as falsely claiming scientific validity. Biorhythm critic responses range from opposing it as harmful through ignoring it to accepting it as entertainment. Some biorhythm critics raise one or more of the following criticisms for the various theories that fall under the category of Biorhythmics:

• Arbitrary assumption of sinusoidal cycles,
• Arbitrary assumption of a neutral baseline,
• Arbitrary choice of the periods of 23, 28, and 33 days,
• Assumption that the cycles are the same for everyone,
• Assumption that the cycles are set to zero at the moment of birth,
• Assumption that the cycle lengths are unchanging throughout one's life,
• Reliance on anecdotes,
• Arguments based on ignorance of number theory,
• Basic mistakes in setup of tests of the hypothesis,
• Inadequate quantitative generalizations of complex human behavior,
• Non-precise formulations of existing theories,
• Peer review failures of experimental data,
• Replication failures, and
• Some unscrupulous practitioners' resemblance to professional fortune-telling fraud artists

Application

In the workplace, railroads and airlines have experimented the most with biorhythms. A pilot describes the Japanese and American attitudes towards biorhythms. [1] He acknowledges, researching his pilot logbook, that his greatest errors of judgment occurred during critical days, but concludes that an awareness of one's critical days and paying extra attention is sufficient to ensure safety. A former United Airlines pilot and user of the Biorhythms for Windows[2] program confirms that United Airlines used biorhythms until the mid-1990s, while the Nippon Express air freight still used biorhythms.
Charting biorhythms for personal use was quite popular in the United States during the 1970s; many places (especially arcades and amusement areas) had a biorhythm machine where you could enter your date of birth and get a current chart.
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