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 made this tone famous is a name. Cousto called it the Om tone and wrote that Indian sitar and tampura music is tuned to it, though he published no measurements. Where researchers have marked the keynote of Indian concert recordings by hand, it follows each singer's voice: in 547 such recordings, about one in five of the men's sit within a quarter-tone of 136.10 Hz, and just one of the women's. The Om frequency guide sets out the count. 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. Cousto's name ties the tone to Om, the syllable with which, the Chandogya Upanishad says, the chant of the Sama Veda begins. The old texts give Om no pitch, though, and the Yoga Sutras ask for its soundless repetition. Fixing Om to one number is a modern step, and 136.10 Hz is one answer among several.
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. The tone is linked with the syllable OM because Cousto named it so. In Indian classical music each singer chooses the keynote, Sa, that suits their voice, and the drone behind the raga is tuned to it, so 136.10 Hz is a common keynote for a man and a rare one for a woman. 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 thin. A 2025 review of Om meditation found 20 studies, 17 of them without randomisation and most lasting three days or less. In the small studies of chanting, the clearest changes follow the slow breathing a long Om demands, and none of them used 136.10 Hz or any fixed pitch. 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
- Hans Cousto, the year tone (Planetware, in German)
- Gulati and others, Indian Art Music Tonic Datasets (Zenodo)
- Kumar and others (2025), a review of Om meditation (PubMed)
- Bernardi and others (2001), rosary prayer and yoga mantras (BMJ)
Listen at a comfortable volume, keep sessions gentle, and notice your own response without forcing a result.
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. Hans Cousto doubled the 365.2422-day tropical Earth year 32 times to reach this tone and named it Om. The old texts give Om no pitch, and Indian singers each choose their own keynote: in 547 concert recordings, about one in five of the men's sat within a quarter-tone of 136.10 Hz, and just one of the women's.
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.
