Returning to Rhythm
A 13 cycle solar calendar. Your daily frequency. One app.
What is SOL Rhythm?
Biosynchronisation through solar time.
SOL Rhythm is a science-informed framework rooted in chronobiology — the study of natural biological rhythms.
It tracks daily solar phases through a 13-cycle calendar, offering a simple daily orientation designed to restore internal rhythm.
Our
Purpose
Returning rhythm to humanity
Modern life runs on artificial schedules. Over time, this can disrupt natural biological rhythm — affecting sleep, energy, and focus.
SOL Rhythm reintroduces a solar reference point. One person, one cycle at a time.
How Does It Work?
Precise. Natural. Daily.
01 — The Solar Calendar Following the calendar begins the rhythm. A 13-cycle solar calendar anchored to the Spring Equinox. Each cycle is 28 days. Every cycle has a purpose.
02 — Personal Daily Rhythm Reading SOL Rhythm reads the current solar phase and generates your daily rhythm orientation.
03 — The Frequency Each solar phase carries a frequency. SOL Rhythm identifies it and delivers it as a daily tone.
04 — Natural Coherence The natural result of daily solar alignment.
Everything you need. One place. The SOL Rhythm app — coming 2026.
SOL Rhythm App
Coming 2026
The next phase of SOL Rhythm will expand into a real-time solar tracking app designed for daily integration.
Planned features include:
• Daily solar phase orientation
• Audio tone delivery
• Personal rhythm tracking
• Phase-based reminders
• Expanded cycle insights
Early access will be offered to SOL Rhythm users.
Join the journey
Early calendar users will receive priority access to the SOL Rhythm app upon release.
Frequently Asked Questions
Everything you need to know about Sol Rhythm and the 13 cycle solar sidereal calendar.
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The sun is the most stable, universally shared biological timing system on Earth. Solar rhythm governs circadian regulation, hormonal cycles, seasonal energy, and biological pacing. It is astronomically fixed and mathematically repeatable.
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Consistent alignment with natural solar rhythm supports nervous system regulation, improved sleep, sustained energy, and greater daily coherence. Sol Rhythm provides the framework. Your body does the rest.
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Yes. The system is grounded in chronobiology — the scientific study of biological rhythms and their relationship to natural time cycles.
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13 cycles of 28 days equals 364 days. The remaining day — 21 March — sits outside the cycle as the Day Out of Time. A single day of pause before the new solar year begins on 22 March.
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The Spring Equinox marks the moment the sun crosses the celestial equator — the most astronomically precise and globally shared moment in the solar year.
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No. Sol Rhythm is not an astrological system. No star signs, no birth charts, no prediction. It is based entirely on fixed astronomical mathematics.
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SOL Rhythm uses sidereal solar movements as its foundational reference point — providing a more astronomically precise framework than standard solar calculation alone.
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Solar frequencies focus on internal coherence rather than external brain entrainment — utilising the body as the primary technology.
Available within the SOL Rhythm App — launching 2026.