The Sikora Biorhythm Method: Origins and the Three Cycles
The Sikora biorhythm method: who Dr. Jerzy Sikora was, the Fliess–Swoboda–Teltscher origins, the three cycles, discrete phases vs a sine wave, the honest science.
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Biorhythms by Dr. Sikora’s method, key days and curiosities.
41 guides · 8 languages
Basics 5
Biorhythm birth time correction explained
Biorhythm birth time correction in Dr. Sikora's method: a morning birth counts one day further into the cycle than an afternoon birth. A small shift that decides whether a day turns critical.
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How to calculate a biorhythm, step by step
How to calculate a biorhythm by hand: count the days you've been alive, divide by each cycle, and map the position to Dr. Sikora's discrete phases.
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How to read a biorhythm chart: phases, not the curve
How to read a biorhythm chart the honest way: focus on the discrete phase symbols and critical days of Dr. Sikora's method, not the height of the sine wave.
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What are biorhythms? Dr. Sikora's method explained
Biorhythms as discrete phases, not a sine wave. Dr. Jerzy Sikora's method: three cycles, key days and a birth-time correction — and how to read them.
Read →Critical days 5
Biorhythm zero day: what the silent turning point means
A biorhythm zero day (0) is when a cycle returns upward after its low phase — a quiet, neutral moment in Dr. Sikora's four-state method. Here is what it means.
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Emotional biorhythm critical days: why the cycle has two
Emotional biorhythm critical days come in a pair. The 28-day cycle is even-numbered, so its phase switch spans two consecutive days, not one. Here is the arithmetic.
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Triple critical day: when all three biorhythms turn at once
A triple critical day is when the physical, emotional and intellectual cycles all switch phase together. It is rare — here is how often it happens and what it means.
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What to do on a biorhythm critical day: a wellness guide
A biorhythm critical day is a phase transition, not a bad omen. Practical, reflective tips to move through the day with more ease and awareness.
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Biorhythm critical days: what they are and why they matter most
A biorhythm critical day is when a cycle switches phase. In Dr. Sikora's method it is marked X — and matters more than any high. Here's how to read it.
Read →Compatibility 6
Biorhythm Compatibility Calculator: Compare Two People
A biorhythm compatibility calculator takes two birth dates and lines up both people's three cycles. How to use one, and how to read the result honestly.
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Emotional phases compatibility: do partners' cycles align?
When two people's emotional biorhythm phases meet, the combination shapes patience, empathy and friction. Learn to read phase pairs, not raw percentages.
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Biorhythm compatibility for friends and family
Biorhythm compatibility is not only for couples. Friends, siblings, and colleagues share intellectual and physical cycles too. Here is how to read them.
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Biorhythm compatibility percentage vs. discrete phases
Generic calculators show '78% compatibility' — a number that means little. Dr. Sikora's method counts discrete phases instead. Here is why phases matter more.
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Biorhythm compatibility planning: best days for a couple
Compatibility planning with biorhythms helps couples find shared high-phase windows for trips or important events and spot days worth treating gently.
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Biorhythm compatibility: comparing two people's cycles
Biorhythm compatibility compares two people's three cycles. In Dr. Sikora's method it is read as phase overlap, not one flat percentage. Here's how to read it.
Read →Sports & body 5
Biorhythm critical days injury risk: a wellness view
On physical critical days in the 23-day biorhythm cycle many athletes feel off. Sikora's method reads it as a day for technique over records — here's what it means.
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Biorhythm peak performance days: find your best windows
Biorhythm peak performance days occur when the 23-day physical and 28-day emotional cycles are both high. Learn to spot these windows and plan your effort.
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Biorhythm physical cycle recovery: a training map
The biorhythm physical cycle and recovery: read Dr. Sikora's 23-day high, low and critical phases to plan training load and rest days. A practical wellness map.
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Biorhythm running endurance: plan your long runs smarter
Biorhythm running endurance: use the 23-day physical cycle from Dr. Sikora's method to plan long runs, tempo sessions and recovery weeks. A practical guide.
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Biorhythm sports performance: timing your peak form
Biorhythm sports performance reads the 23-day physical cycle — Dr. Sikora's high, low and critical phases — to plan hard training and race days. Here's how.
Read →Productivity 5
Biorhythm creativity: when your mind creates best
Biorhythm creativity planning pairs your 33-day intellectual cycle with the 28-day emotional one to time creating versus editing — a lens, not a verdict.
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Biorhythm and decision-making: when to decide
Biorhythm and decision-making: use Dr. Sikora's 33-day intellectual cycle to time big choices, spot mood-driven impulses and act with clearer self-awareness.
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Biorhythm productivity planning: structure your week
Biorhythm productivity planning uses Dr. Sikora's 33-day intellectual cycle to time deep work, routine and rest across your week — a planning lens, not a verdict.
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Biorhythm studying and exams: plan with your intellectual cycle
Use the 33-day intellectual biorhythm cycle to plan studying sessions and approach exams with confidence. Dr. Sikora's method as a wellness lens, not a verdict.
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Chronoworking vs biorhythm: what is the difference
Chronoworking aligns work to your chronotype (lark or owl, 24-hour cycle). Biorhythm tracks 23–33 day cycles. They are orthogonal — use both without conflict.
Read →Health & mood 5
Biorhythm mood: the 28-day emotional cycle explained
Your biorhythm emotional cycle is a 28-day mood rhythm counted from birth. Learn its four phases, why it has two critical days, and how to read it as wellness.
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Biorhythm energy levels: reading your natural highs
Biorhythm energy levels combine the 23-day physical and 28-day emotional cycles. Learn to read your natural highs and lows as a calm wellness lens, not a forecast.
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Biorhythm jet lag: what travel disrupts (and what it doesn't)
Jet lag throws off your circadian clock — but your Sikora biorhythm cycles run unchanged across time zones. Here is what that means for travel planning.
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Biorhythm sleep: can the emotional cycle predict restless nights?
The 28-day emotional biorhythm is not your sleep clock, but its low phase may colour how you feel at bedtime. Here's how to read both without confusing them.
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Biorhythm stress resilience: using your emotional cycle
Your emotional biorhythm phase shapes how sensitive you are to stress. Learn to read low and critical days as a cue for self-compassion, not a diagnosis.
Read →Body rhythms 5
Body clock: how it works and what throws it off
Your body clock is the ~24-hour rhythm that runs sleep, energy and hormones. How it works, what disrupts it, and why it is not the same as a biorhythm.
Read →Chronotype vs biorhythm: two body clocks
Chronotype vs biorhythm: one is your real 24-hour preference for when you peak, the other an unproven tradition of cycles from birth. How to tell them apart.
Read →Cycle syncing vs biorhythm: two ways to plan
Cycle syncing times your life to your menstrual cycle; a biorhythm counts from your birth date. One tracks a real hormonal rhythm, the other does not.
Read →Infradian rhythm: cycles longer than a day
An infradian rhythm is any body cycle longer than 24 hours, like the menstrual cycle. How it differs from a biorhythm, and which infradian rhythms are real.
Read →Ultradian rhythm: the 90-minute cycles in your day
An ultradian rhythm is a body cycle shorter than a day, like the ~90-minute loops of sleep and focus. How to work with it, and how it differs from a biorhythm.
Read →Myths & facts 5
Biorhythm vs astrology: what's the difference?
Biorhythm vs astrology compared across 7 dimensions: both start from birth, but one is fixed arithmetic, the other a symbolic tradition. An honest look.
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Private biorhythm calculator: your cycles stay on your device
aimy.bio is a private biorhythm calculator: no account, no server, no ads — your birth date and diary live only in your browser's localStorage.
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Biorhythm vs circadian rhythm: the difference
Biorhythm vs circadian rhythm: one is your real, science-backed ~24-hour body clock, the other an unproven wellness tradition of three cycles from birth.
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The open biorhythm study: testing the method with you
aimy.bio runs an open, anonymous biorhythm study to honestly test Dr. Sikora's method — blinded ratings, pre-registered analysis, results published even if null.
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Do biorhythms work? An honest look at the evidence
Do biorhythms work? Honestly, the science is skeptical. Here's the evidence, what it shows and doesn't, and how to use biorhythms anyway as a wellness lens.
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