The long view of three cycles

Life-Cycle Milestone Chart

Mark birthdays, paired crossings and the rare occasions when all three classic biorhythm cycles meet or fully reset.

Ages 10–20Return to my current decade
18 Oct 2006 to 18 Oct 2016

Your cycle crossings

40markers in this window
Biorhythm milestones between ages 10 and 20Six tracks mark birthdays, paired zero crossings, triple crossings and complete resets. Birthdays Physical + emotional Physical + intellectual Emotional + intellectual All three at zero Complete reset age 10age 11age 12age 13age 14age 15age 16age 17age 18age 19age 20 18 Oct 2006 12:00 — 10th birthday. A personal anniversary marker. 1 Dec 2006 12:00 — Emotional + intellectual. Both cycles cross zero together. 10 Mar 2007 12:00 — Physical + intellectual. Both cycles cross zero together. 18 May 2007 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2007 12:00 — 11th birthday. A personal anniversary marker. 7 Mar 2008 12:00 — Emotional + intellectual. Both cycles cross zero together. 24 Mar 2008 00:00 — Physical + intellectual. Both cycles cross zero together. 4 Apr 2008 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2008 12:00 — 12th birthday. A personal anniversary marker. 20 Feb 2009 12:00 — Physical + emotional. Both cycles cross zero together. 7 Apr 2009 12:00 — Physical + intellectual. Both cycles cross zero together. 12 Jun 2009 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2009 12:00 — 13th birthday. A personal anniversary marker. 8 Jan 2010 12:00 — Physical + emotional. Both cycles cross zero together. 22 Apr 2010 00:00 — Physical + intellectual. Both cycles cross zero together. 17 Sep 2010 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2010 12:00 — 14th birthday. A personal anniversary marker. 26 Nov 2010 12:00 — Physical + emotional. Both cycles cross zero together. 6 May 2011 12:00 — Physical + intellectual. Both cycles cross zero together. 14 Oct 2011 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2011 12:00 — 15th birthday. A personal anniversary marker. 23 Dec 2011 12:00 — Emotional + intellectual. Both cycles cross zero together. 20 May 2012 00:00 — Physical + intellectual. Both cycles cross zero together. 31 Aug 2012 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2012 12:00 — 16th birthday. A personal anniversary marker. 29 Mar 2013 12:00 — Emotional + intellectual. Both cycles cross zero together. 3 Jun 2013 12:00 — Physical + intellectual. Both cycles cross zero together. 19 Jul 2013 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2013 12:00 — 17th birthday. A personal anniversary marker. 6 Jun 2014 12:00 — Physical + emotional. Both cycles cross zero together. 18 Jun 2014 00:00 — Physical + intellectual. Both cycles cross zero together. 4 Jul 2014 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2014 12:00 — 18th birthday. A personal anniversary marker. 24 Apr 2015 12:00 — Physical + emotional. Both cycles cross zero together. 2 Jul 2015 12:00 — Physical + intellectual. Both cycles cross zero together. 9 Oct 2015 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2015 12:00 — 19th birthday. A personal anniversary marker. 11 Mar 2016 12:00 — Physical + emotional. Both cycles cross zero together. 16 Jul 2016 00:00 — Physical + intellectual. Both cycles cross zero together. 18 Oct 2016 12:00 — 20th birthday. A personal anniversary marker.
BirthdayTwo cyclesAll three at zeroComplete reset
Emotional + intellectual1 Dec 2006age 10.1 · Both cycles cross zero together.
Physical + intellectual10 Mar 2007age 10.4 · Both cycles cross zero together.
Physical + emotional18 May 2007age 10.6 · Both cycles cross zero together.
Emotional + intellectual7 Mar 2008age 11.4 · Both cycles cross zero together.
Rare whole-life markers

When all three classic cycles meet

Triple crossingAge 29.1

All three classic cycles meet at zero.

Triple crossingAge 58.2

All three classic cycles meet at zero.

Complete resetAge 58.2

All three cycles restart in their original direction.

Triple crossingAge 87.3

All three classic cycles meet at zero.

Crossing versus reset

Zero is a meeting point, not always a restart

Every classic cycle crosses zero twice per cycle: once while rising and once while falling. Two cycles can therefore share a zero crossing without restarting in the same direction.

A three-cycle zero crossing repeats after 10,626 days (about 29.1 years). A complete reset, with all three returning to zero in their original upward direction, repeats after 21,252 days (about 58.2 years).

Difference between a zero crossing and a full resetThree sine waves cross the centre line together, while arrows show that direction determines whether the moment is a full reset.shared zero crossingdirection decides reset
What the mathematics says

Why these dates repeat

Physical + emotional

Their zero crossings coincide every 322 days.

Physical + intellectual

Their zero crossings coincide every 379.5 days.

Emotional + intellectual

Their zero crossings coincide every 462 days.

These are mathematical coincidences within classic biorhythm theory, which is not scientifically established. The chart is for reflection and entertainment, not prediction.

Continue exploring

Move between a single day, a month, a whole year or the longer story of your cycles.

Daily view Biorhythm Calculator Zoom into the physical, emotional and intellectual curves around a chosen day. Month view Personal Calendar Follow the three classic cycles through a focused month-by-month calendar. Two people Compatibility Chart Place two personal patterns together and explore where their rhythms align. Seven rhythms Extended Chart Add intuition, creativity, awareness and spiritual cycles to the classic three.