Frequency guide
Listening context
136.10 Hz is the tone that Hans Cousto's cosmic-octave system links to the Earth year, the journey our planet makes once around the Sun. Often called the OM tone, it is the best known of all the cosmic-octave frequencies, with a warm, even character close to a C-sharp in standard tuning that listeners describe as anchoring rather than activating.
Origin: the astronomy and the octave maths
Cousto's method takes a real astronomical period and doubles its frequency through octaves until it becomes audible. Each doubling raises the pitch by exactly one octave, so a year-long cycle can be lifted, intact in its proportions, into the range of hearing.
The Earth completes one orbit of the Sun in about 365.2422 days, the tropical year measured from one spring equinox to the next. The source table uses that tropical period as an extremely low frequency, a tiny fraction of a single cycle per second, and doubled it through roughly thirty-two octaves to arrive at about 136.10 Hz. What makes this tone famous is a near-coincidence: it falls very close to the pitch at which the syllable Om is traditionally chanted, and to the drone of the Indian tampura in much classical music. Cousto's arithmetic and an old meditative pitch land in almost the same place. The tone remains a translation of the orbit into sound, not a noise the Earth broadcasts into space.
Tradition and mythology
The Earth year is the basic seasonal rhythm of life on the surface: planting and harvest, the slow swing of light and dark, the calendar around which cultures have organised festivals and quiet observances for millennia. The overlap with the chanted Om deepened the tone's standing in meditation circles, where a low drone has anchored reflective practice in Indian traditions for a very long time. Cousto's framework formalises that ancient instinct, that a steady low pitch can settle the mind, with one specific number.
It is worth being precise about the astronomy, because the figures matter to the maths. The 365.256-day sidereal year is measured against the fixed stars; the tropical year we keep our calendars by, the time from one spring equinox to the next, is very slightly shorter at about 365.242 days, the small difference being a consequence of the same axial wobble that gives us the Platonic Year. The quarter-day left over each year is why we add a leap day every four years. The source table’s choice of the tropical year, rather than the day or any shorter rhythm, is what places this tone among the slowest and lowest of the cosmic-octave family, and gives it the grounded, settled quality listeners associate with it.
How listeners use it
- A warm, settled quality that pairs well with slow movement around the room.
- A sense of breathing lengthening on its own without needing to count.
- A backdrop for journaling about the season, the year, or a long arc of work.
- A low presence that fades into the background rather than asking for attention.
What the evidence says
NCCIH’s overview concerns music-based interventions. Our inference is that this evidence does not establish a clinical benefit from this isolated 136.1 Hz tone. Personal enjoyment is a listening response, not a clinical measurement. Read the music research and its limits.
How to listen
- Keep the volume low and steady; this tone is built to sit underneath, not above, what you are doing.
- Try sessions of fifteen to thirty minutes when you want the sound to settle into the room.
- Pair it with a slow stretch, a walk indoors, or a few pages of quiet reading.
- Use a speaker rather than tight in-ear headphones when you can, for a roomier feel.
- Step away or change reference if the steadiness starts to feel monotonous.
136.10 Hz Earth Year: Cosmic Alignment And Listening Context
136.10 Hz, often called the Earth Year tone or the OM frequency, is one of the best known references in the cosmic-octave family of planetary tones. It is a low, warm pitch close to a C-sharp in standard tuning, derived by translating the length of Earth's orbit around the Sun into something we can hear. This page offers it as listening education, symbolism and practice background rather than as a promised outcome.
For direct playback, use the related frequency page: 136.10 Hz: Earth Year.
Where this frequency comes from
The figure belongs to the octave-based tuning system set out by the Swiss mathematician Hans Cousto in the cosmic-octave system he developed in 1978. The idea is simple: any steady recurring motion in nature can be expressed as a tone if it is octave-shifted upward enough times. Earth's year, octave-shifted into the audible range, yields a pitch very close to 136.10 Hz. Many tuning traditions in South Asian music settle near the same low pitch for the sustained drone behind a raga, which is one reason the tone is also widely linked with the syllable OM. For the wider system, see planetary frequencies.
It is worth being clear about the kind of system this is. It is a creative, mathematically inspired tradition rather than a finding from physics. Sound does not travel through the near-vacuum of space, so 136.10 Hz is not the literal noise of the Earth's orbit. It is a translation of motion into something audible, and the meanings attached to it draw from older symbolism, not from astronomy.
Symbolic threads
Because it is tied to the year rather than to a single planet's character, 136.10 Hz is often read as a grounding, centring tone. In yogic mapping conventions used by many modern practitioners it is sometimes paired with the heart centre and themes of balance and warmth. Those pairings are symbolic rather than physiological, and you do not need to accept any particular mapping to find the tone a useful, settling reference for reflective listening.
How listeners use it
Subjective reports vary, as they do for every tone, but recurring notes from people who sit with 136.10 Hz include:
- A warm, grounded quality that fades easily into the background of a quiet hour.
- A sense of slower, easier breathing settling in on its own.
- A useful backdrop for meditation, slow reading or journaling.
- An evening or wind-down feel for some listeners and a steadying morning anchor for others.
A small, repeatable practice tends to work better than an ambitious one:
- Keep the volume conversational so the tone sits underneath your attention.
- Try a first session of around ten minutes and notice your response.
- Pair it with a simple breath count or a familiar journaling prompt.
- Step away from the tone if it ever feels heavy rather than settling.
What the evidence says
The evidence here is early and mixed. Research on slow, sustained tones and on meditation points to general relaxation responses, the same kind many calming activities can support, rather than effects unique to one exact pitch. Studies on any single frequency are small and preliminary, so the older symbolism around 136.10 Hz is best held as a story you find useful rather than a literal claim about what a sound can do. For more on how to read such claims, see the science of sound healing.
Listen with this
If this piece speaks to you, you might explore these tones gently as part of a wind-down or focus routine: 194.18 Hz Earth Day 126.22 Hz Sun 432 Hz.
Sources
NCCIH’s overview concerns music-based interventions. Our inference is that this evidence does not establish a clinical benefit from one isolated listening tone. Personal enjoyment is a listening response, not a clinical measurement. Read the music research and its limits.
- NCCIH: Music and Health, What You Need To Know
- Music and meditation relaxation studies (PubMed)
- Music for relaxation reviews (Cochrane Library)
Listen at a comfortable volume, keep sessions gentle, and notice your own response without forcing a result. Safety note: Harmonance is for relaxation, reflection, and educational exploration. It is not health advice or a replacement for professional care.
What benefits are claimed for 136.1 Hz?
The traditional associations described above are listening themes, not measured outcomes. NCCIH’s overview concerns music-based interventions. Our inference is that this evidence does not establish a clinical benefit from this isolated 136.1 Hz tone. Personal enjoyment is a listening response, not a clinical measurement. Read the music research and its limits.
What is 136.1 Hz?
136.1 Hz means 136.1 cycles per second. Cousto doubles the 365.2422-day tropical Earth year through octaves into this tone, which lands close to the traditional chanted Om and the Indian tampura drone, long used to anchor meditation.
Try the pitch, then notice
Press Play above when you are ready. Start quietly, listen briefly, and use the player’s volume control. Compare the neighbouring tones without judging one as medically superior. Stop if the sound is uncomfortable. Signed-in Studio lets you choose layers and timers; public listening needs no account.
