Illustration: NASA/JPL-Caltech
A real planetary instrument — the solar system's own orbital mechanics, live from NASA JPL, mapped directly to notes you can play.
“SONIKOSMOS: Orbital Mechanics as a New Harmonic Interface and Compositional System”
Illustration: NASA/JPL-Caltech
The actual live interface — all nine bodies (8 planets + the Sun), each labeled with its real, currently-sounding note and cents deviation, computed live from NASA JPL orbital data.
An idea old enough that Pythagoras proposed it and Kepler tried to calculate it by hand — and new enough that only now does the technology exist to actually play it.
Pythagoras first proposed that the planets produce a real harmony from their motion. Kepler spent years trying to measure it by hand, publishing real ratios calculated from the best orbital data available in 1619. Neither had a way to make it playable — there was no live data, and no instrument that could turn it into something a musician could actually hold. SONIKOSMOS: SOL-ω is that instrument: a real-time planetary interface, a compositional system, and an original notation framework, built for any composer to use, not just to listen to.
Rather than delivering a composed artifact, the system functions as an open instrument — a keyboard interface that any performer can play, explore, and compose with in real time. The scientific finding and the musical decision remain permanently in the hands of the user. From the research abstract
This work has been accepted for presentation at SpaceCHI 2026 (September 24–25), the world's first conference dedicated to human–computer interaction in space exploration, hosted at NASA's Ames Research Center — see “The SpaceCHI Presentation” below.
Every planet is orbiting the Sun — and any motion that repeats has a rate. That rate is exactly what a frequency is.
SONIKOSMOS takes that literally. It pulls each planet's real, instantaneous orbital speed — not an average, the actual rate right now, which genuinely changes as a planet swings closer to or farther from the Sun — from NASA JPL's Horizons ephemeris service, built on the DE441 model real spacecraft use for real navigation. That speed converts directly into Hertz.
Those real Hertz numbers are absurdly low — even Mercury, the fastest planet, completes an orbit only once every 88 days. So every planet is shifted up by the exact same number of octaves, together, until Earth lands in an audible register. Nothing about how the planets relate to each other changes; the whole chord just moves up as one. What you hear is never invented or rounded to a scale someone made up to sound nice — it's the actual mathematics of nine real orbits, moved into hearing range.
"A twelve-year-old can sit down and discover Jupiter's chord on the day they were born, with zero math. That accessibility is the whole point — the physics does the work, the human just has to be willing to explore." Javier Roqueni (Java Roque), creator of SONIKOSMOS
The instrument doesn't stand alone. Four more real, live pieces ship with it: how to plug it into real hardware, how to read exactly what it's doing, how to tune to it by ear, and a companion tool that already knows which day of the year is worth looking at.
Each one runs on the same live orbital data as the sound itself, updates in real time, and imposes nothing on the way there — no diagram here ever hard-codes a favorite root or chord. Whatever looks interesting has to earn it, the same day everyone else is looking at.
SONIKOSMOS speaks two real, physical languages beyond the browser itself.
Over MIDI, every planet becomes its own MPE channel — live controller output that any MPE-aware synth, software instrument, or real acoustic/electric instrument (tuned by ear against the live readout, or with ORBITUNER below) can receive. Each voice takes the nearest true note plus a continuous pitch bend, so the actual orbital drift glides exactly the way that planet's real velocity moves — never stepped, never rounded to a scale.
Over Eurorack, a dedicated CV Drone mode sends every real planetary frequency out as continuous 1V/Octave control voltage through a DC-coupled multichannel interface — Expert Sleepers' ES-8 is the one this was built against and measured on. Patch any output straight into a VCO's V/Octave input, and that body drones continuously, alongside however many others are assigned, completely independent of whatever's on screen. Confirmed against a real voltmeter: intended 0.720V measured 0.722V — accurate to the hundredth of a volt, not just on paper.
ORBITSCOPE is the built-in harmonic analyzer — four live views of the same nine real frequencies, reading whatever the solar system is actually doing on the date on screen, with one-click prev/next-day arrows to step through any other.
The Celestial Scale notates every body on a real staff, sortable by note, pitch, or orbital order. The Celestial Circle lays out all 28 real pairwise intervals at once, color-coded from pure to dissonant, with a toggle between Just Intonation and 12-tone equal temperament. The Circle of Fifths arranges the same nine pitches with no root or chord ever singled out on the diagram itself — that read lives separately, ranked among its alternates, in a dedicated Harmonic Anomalies list. The Pitch Spiral maps real Hertz against real just-intonation spokes, with no 12-TET grid anywhere in sight.
Underneath all four, a List of Planets table carries every body's real orbital velocity, true frequency, note, cents deviation, and actual octave — the exact numbers driving the sound, not a separate estimate for display.
| Body | Orbital velocity | True freq | Note | Cents | Actual octave | |
|---|---|---|---|---|---|---|
| ♁ | Earth | 1.957e-7 rad/s | 3.115e-8 Hz | C | +39¢ | -29 |
| ☿ | Mercury | 7.749e-7 rad/s | 1.233e-7 Hz | C | +21¢ | -27 |
| ♄ | Saturn | 6.887e-9 rad/s | 1.096e-9 Hz | D | +44¢ | -34 |
| ♂ | Mars | 1.054e-7 rad/s | 1.677e-8 Hz | D | -33¢ | -30 |
| ♃ | Jupiter | 1.617e-8 rad/s | 2.573e-9 Hz | F | +22¢ | -33 |
| ♅ | Uranus | 2.308e-9 rad/s | 3.674e-10 Hz | G# | -48¢ | -36 |
| ♆ | Neptune | 1.223e-9 rad/s | 1.946e-10 Hz | A | -48¢ | -37 |
| ♀ | Venus | 3.193e-7 rad/s | 5.082e-8 Hz | A | -14¢ | -29 |
| ☉ | Sun | 2.972e-6 rad/s* | 4.730e-7 Hz | B | +48¢ | -26 |
Two more ORBITSCOPE screens, live for the same day — the Celestial Circle's 28 real pairwise intervals, and the Circle of Fifths with no root ever singled out on the diagram itself.
ORBITSCOPE, live — the Celestial Scale and List of Planets for September 4, 2026, exactly as it opens inside the app.
ORBITUNER turns any acoustic or electric instrument — or a voice — into something that can tune directly against the real solar system, no MIDI or software instrument required.
It listens through a microphone, locks onto whichever of the nine real bodies the played pitch is closest to, and shows the exact deviation in cents on a curved arc dial that glows green within eight cents of pure. A target picker lets it auto-follow the closest match or lock to one body by hand; a full nine-row list keeps every target's real note and cents value on screen at once.
| Body | Note | Target ¢ | |
|---|---|---|---|
| ☿ | Mercury | C | +21¢ |
| ♀ | Venus | A | -14¢ |
| ♁ | Earth | C | +39¢ |
| ♂ | Mars | D | -33¢ |
| ♃ | Jupiter | F | +22¢ |
| ♄ | Saturn | D | +44¢ |
| ♅ | Uranus | G# | -48¢ |
| ♆ | Neptune | A | -48¢ |
| ☉ | Sun | B | +48¢ |
ORBITUNER, live — locked on and reading real cents against the same September 4, 2026 data.
The solar system doesn't know our tuning system exists — and it never asked to be beautiful. It just is, on its own terms.
On an ordinary day, the nine real celestial frequencies land wherever orbital mechanics happens to put them, completely indifferent to any scale a human ever invented. No chord, no order imposed from outside — just nine real bodies, each running on its own true math, the way they have for billions of years before anyone was listening.
But that same indifferent physics also produces real beauty, unasked. Some days, by pure celestial coincidence, two worlds land on an exact, whole-number ratio — a perfect fifth, a pure fourth — the same intervals a plucked string finds on its own, arrived at by orbital mechanics instead of a musician's ear.
And on the rarest days in an entire year, it goes further than any two bodies ever could: five, six, seven of the nine real voices converge at once into an actual, nameable chord or scale — the kind any trained ear would recognize instantly, occurring by nothing but the true positions of real worlds. It happens close to never. When it does, a companion tool, the Harmonic Ephemeris, has already found it — scanning a full calendar year in advance and rating exactly how rare each moment is: the solar system's own harmonic weather, dated and forecast before it happens.
“A chord is a moment in time.” SONIKOSMOS Manifesto — Compositional System
For two days running, real celestial coincidence turns Jupiter into a tonal center the rest of the solar system briefly organizes around. On April 25, six bodies lock into a real Lydian / Lydian Dominant scale. By the next day the configuration has drifted — without ever losing Jupiter as its root — into two more genuine scales, Dorian ♯4 and Lydian ♯2, both still rated “Extremely Rare.” Nobody scheduled any of this. It's just where the planets happened to be.
On New Year's Day, all nine bodies together completed a chord any listener would recognize instantly — E Minor 11th, all six of its notes present among the nine real voices, no rounding required. On January 19, Venus and Mars alone locked into a pure 13:10 ratio, the same kind of relationship Pythagoras first noticed in a vibrating string 2,500 years ago. And coming up on September 10, seven of the nine bodies converge on a real just-intonation chord built from a perfect fifth, a perfect fourth, a major third, and a harmonic seventh — a genuine seven-note chord, in tune with itself by nothing but orbital mechanics.
If, by nature, a string playing a fifth feels good in our bones — I wonder: does the solar system actually playing a fifth affect us somehow? Javier Roqueni
Composed by Java Roque · recorded September 4, 2026
Heliosheath (n.) — the turbulent, high-pressure boundary zone at the edge of the solar system, where the solar wind crashes into interstellar space.
One example of what the instrument makes possible — not a demo of a fixed feature, but a real composition built entirely from it.
Listen: the harmony of the planets, September 4th.
Real instruments, tuned to real planets — not a metaphor, an actual retuning.
A viola was tuned string by string across all nine real celestial frequencies of that exact day, an electric guitar was tuned to Jupiter — the day's tonal center — and the synths underneath are tuned 100% to the same real planetary frequencies, with nothing quantized to a conventional scale. SONIKOSMOS's live readout supplied the target frequencies and cents deviations in real time as each string was brought into tune. What follows is the resulting recording: a real duet over a fully planet-tuned bed, playing a chord that existed nowhere until that day's specific planetary positions produced it. It's the first release from Olympus Mons, an upcoming album named for the largest known volcano and tallest planetary mountain in the solar system.
That's not a rendering for this page — it's four panels from SONIKOSMOS's own live ORBITSCOPE (its harmonic analyzer), pointed at September 4, 2026, the same ones anyone can open on any date.
The Celestial Scale — the exact chord “Heliosheath” was built from, notated live. Vertical position is each body’s true note; left to right, it climbs as a real ascending scale.
The Celestial Circle — all 28 real pairwise intervals at once, color-coded from pure to dissonant. Earth–Neptune landed on an exactly pure interval that day — 0¢ off.
The Circle of Fifths — the same nine pitches, arranged with no root or chord ever singled out on the diagram itself (a deliberate rule, same as the Celestial Circle above). The best-fit read — D Minor 7th — lives separately, ranked among its alternates, in the Harmonic Anomalies list.
The Pitch Spiral — real Hz, real just-intonation spokes, no 12-TET grid anywhere in sight.
| Body | Note | Cents | Role that day |
|---|---|---|---|
| ☿Mercury | C | +21¢ | Viola |
| ♀Venus | A | −14¢ | Viola |
| ♁Earth | C | +39¢ | Viola |
| ♂Mars | D | −33¢ | Viola |
| ♃Jupiter | F | +22¢ | Tonal center — viola & guitar |
| ♄Saturn | D | +44¢ | Viola |
| ♅Uranus | G♯ | −48¢ | Viola |
| ♆Neptune | A | −48¢ | Viola |
| ☉Sun | B | +48¢ | Viola |
Re-tuning, string by string: the viola's Earth string, mid-tuning — the app reads +39.4¢, matching SONIKOSMOS's real readout exactly.
Prior approaches to planetary sonification have typically gone one of two ways.
Either existing Western scale pitches get assigned to planetary bodies — rounding real frequencies to the nearest chromatic note for aesthetic coherence — or the result is a fixed composition that requires no interaction from the listener. SONIKOSMOS: SOL-ω departs from both. First, it preserves exact planetary frequencies with no quantization to any pre-existing tuning system at all: the physics is the musical material, unmodified, and the resulting scales exist outside any prior musical tradition. Second, rather than delivering a finished, composed artifact, it's an open instrument — a keyboard interface any performer can play, explore, and compose with in real time. The scientific finding and the musical decision stay permanently in the hands of the user, not the system.
Every frequency traces back to NASA JPL's Horizons ephemeris service (DE441 model) or its own published Keplerian approximation — the same physics used to fly real spacecraft, not a generative or procedural stand-in for "space sound."
Each planet's pitch genuinely rises and falls as it sweeps faster near perihelion and slower near aphelion — real orbital mechanics, heard as real pitch drift, in real time.
A companion Harmonic Ephemeris scans all of 2026 in advance for genuinely rare chord and scale alignments — e.g. April 25, 2026, when six of nine bodies align into a real Lydian/Lydian Dominant scale, rated "Extremely Rare."
Because every date has its own real configuration, a date becomes as creatively meaningful a choice as a key signature — play the sky the day you were born, or a thousand years from now.
Runs in any browser, free, with a built-in reference tone or full MIDI/MPE output to a real synth — and to real acoustic and electric instruments, tuned either by ear against its live readout or with ORBITUNER, a built-in auto-locking tuner that listens through your mic and shows how far off you are from whichever real body you're closest to.
Instead of inheriting twelve-tone equal temperament by default, a performer discovers their own harmonic material from a real physical source — no specialist math required to use it.
Java Roque is the research and performance practice of Javier Roqueni, a Berklee College of Music student building instruments that translate real physical data into music. SONIKOSMOS: SOL-ω is his first major work under that practice, and the first entry in a planned series applying the same method to other stellar systems and physical quantities.
His work sits at the intersection of composition and human–computer interaction: SONIKOSMOS has been accepted for presentation at SpaceCHI 2026 (September 24–25), hosted at NASA's Ames Research Center, framed not as a musical novelty but as a new interaction modality for making planetary science data — position vectors, angular velocities, orbital frequencies — perceptible to non-specialists for the first time. Berklee President Jim Lucchese noted the invitation may be a first for the college.
The question is an old one. Pythagoras first proposed musica universalis — that each celestial body produces a tone from its motion. Aristotle attacked it directly: bodies that massive, moving that fast, would have to be deafening, and since we hear nothing, the premise must be wrong. Then in 1619, Kepler calculated the real ratio between each planet's speed at its closest and farthest points from the Sun and assigned each one an actual musical interval — a genuine measurement, not numerology. “SONIKOSMOS does exactly what Kepler did, four centuries later, with a live ephemeris API instead of a table of hand-calculated positions,” says creator Javier Roqueni.
That history is also why he built it to require nothing. “Right now, musicians personalize melody, rhythm, even timbre. But almost nobody personalizes the harmonic system itself — the actual scale, the actual frequencies available to them. I think the next real frontier in music isn't just ‘my song’ — it's ‘my scale.’” Before this, he says, engaging with real orbital harmony meant being a specialist who could read ephemeris tables by hand. “Now it just requires a keyboard and curiosity. A twelve-year-old can sit down and discover Jupiter's chord on the day they were born, with zero math. That accessibility is the whole point — the physics does the work, the human just has to be willing to explore.”
Because every date has its own real planetary configuration, Roqueni sees date itself as an entirely new kind of compositional decision. “Music has always had rhythm, melody, and harmony. SONIKOSMOS adds a fourth variable that's never really existed before: date. … A date becomes as creatively rich a decision as a key signature — except instead of twelve options, you have an infinite continuum, and each one is physically real, not arbitrary.”
Art has mirrored nature since antiquity — proportion borrowed from the body, geometry borrowed from the shell and the flower. Roqueni frames SONIKOSMOS as the same instinct, aimed at sound itself. “Equal temperament exists because it's convenient — we fixed twelve frequencies so a piano could modulate between keys without retuning. That's a beautiful compromise, but it's a compromise built for the instrument, not derived from nature. … I built the keyboard to receive nature's actual frequencies, unfiltered. If music is trying to express something true, I think some of that truth is sitting in the parts of nature we haven't listened to yet. I want this to be a way of listening to the universe, not just studying it.”
Javier Roqueni (Java Roque), creator of SONIKOSMOSSONIKOSMOS has been accepted for presentation at SpaceCHI 2026 — not as a musical novelty, but as a genuine interaction modality for making planetary science data humanly navigable.
SpaceCHI 2026 runs September 24–25 at NASA's Ames Research Center in Mountain View, California, with a hybrid remote track, organized by MIT Media Lab, Fraunhofer FIT, and NASA Ames. It's the first conference of its kind: human–computer interaction applied specifically to space exploration, spanning human–AI and human–robot interaction, trust & autonomy, cognitive load modeling, and space architecture, among other fields — the premise being that HCI's tools have already helped scale major technologies before, from the personal computer to groupware, and are now essential to the current transformation happening in space. Submissions go through double-blind peer review, and accepted work is published in a Springer Nature proceedings volume with its own DOI.
“My submission was reviewed against that lens specifically — not ‘is this cool music,’ but ‘is this a genuine interaction modality for making space data humanly navigable,’” says creator Javier Roqueni. “Planetary science data — position vectors, angular velocities, orbital frequencies — exists as numerical output with no immediate perceptual analog. It's meaningful to specialists, but unavailable as lived, embodied knowledge to everyone else. SONIKOSMOS is my answer to that as an HCI problem, not just an artistic one.”
A reviewer for SpaceCHI — the space + human–computer-interaction research conference — called sonification “a novel and creative approach” to “supporting human navigation and interpretation of large, complex datasets,” one of HCI's oldest and hardest problems. SpaceCHI peer review, on SONIKOSMOS
| Data source | NASA JPL Horizons ephemeris service (DE441 model), plus JPL's own published Keplerian approximation for offline/no-network use |
| Physics | ω(t) = |r×v| / |r|² — Kepler's Second Law, evaluated per body, per instant |
| Voices | 9 — the eight planets plus the Sun's own rotation |
| Tuning rule | One shared octave multiplier for all nine voices — every real inter-planet ratio preserved exactly; never quantized to 12-TET |
| Input | Real MIDI/MPE controller or synth, or a built-in computer-keyboard reference tone — no install required |
| Built-in tuner | ORBITUNER — a live, auto-locking chromatic tuner: listens through your mic, matches your pitch to the closest of the nine real bodies, and shows your deviation in real cents |
| Harmonic analyzer | ORBITSCOPE — the Celestial Scale, Celestial Circle, Circle of Fifths, and Pitch Spiral views, all live, all reading real frequencies, never a root or chord highlighted on the diagrams themselves |
| Companion project | SONIKOSMOS: SOL-ω Harmonic Ephemeris — a precomputed year-long almanac of rare real chord/scale alignments |
| Notation system | Orbital Notation — the SOL Clef, the Dectave, the Nonagram, and the Orbital Timeline, an original written language for nine-body, non-tempered music |
| First recording | “Heliosheath,” Sept. 4, 2026 — viola (9 celestial bodies) + electric guitar (Jupiter) + planet-tuned synths; Track One of the forthcoming album Olympus Mons |
| Recognition | Accepted for presentation at SpaceCHI 2026 (Sept 24–25, 2026), NASA Ames Research Center — a first for Berklee College of Music, per its president |
| Access | Free, browser-based — javaroque.com/sonikosmos-sol-omega |
For interviews, additional assets, or questions about the physics, data sources, or “Heliosheath.”