REFERENCE-VALIDATED, MIT-LICENSED GNSS + ASTRODYNAMICS ENGINE
GNSS and astrodynamics primitives. Rust-fast, native to your language.
A Rust core for SGP4, SPP/RTK/PPP, RINEX and observation quality control, real-time RTCM and NTRIP streams, frames and time, ionosphere, and conjunction, checked against Vallado, Skyfield, IGS, teqc, and IERS, with idiomatic interfaces in Rust, Python, C, Elixir, and WebAssembly.
cargo add sidereon
crates.io
propagating the live constellation · GPS · Galileo · GLONASS · BeiDou
WASM LIVE · RUNNING IN THIS TAB NET 0
LIVE SPP SOLVE · IGS STATION ABMF (GUADELOUPE) · IN-BROWSER
computing first fix…
The whole engine, running client-side in your browser right now.
LIVE · WEBASSEMBLY INTERFACE
And the whole engine runs in your browser.
Everything below is the same core compiled to WebAssembly, executing client-side in this tab. Drag the globe, drop an observer, run the solve. Maximize any panel for the full detail and the underlying calculations. After load there are zero server calls.
LIVE GLOBE · CLICK TO SET OBSERVER NET 0
OBSERVER
CLICK THE GLOBE TO DROP AN OBSERVER
drag to orbit · + / − to zoom · click to drop an observer
The live constellation, propagated client-side. Click the globe to set the observer for the skyplot beside it.
OBSERVER · LIVE SKYPLOT REAL-TIME AZ / EL · TOPOCENTRIC LOOK ANGLES
CLICK THE GLOBE TO SET AN OBSERVER
NEXT PASSES · 6H
SGP4 propagation to current UTC, then topocentric az / el from the observer. Arcs are each satellite's real pass over ±45 min.
SOLVE · REAL IGS STATION ABMF (GUADELOUPE) NET 0
computing first fix…
RINEX OBS + BROADCAST NAV→solveBroadcast() · Rust→WASM→ECEF → LLH
CONFIGURE THE SOLVE · each change re-runs the real WASM fix
ATMOSPHERE CORRECTIONS
Klobuchar ionosphere · Saastamoinen troposphere
ELEVATION MASK 10° satellites above the mask feed the fix
RAW VS ACTIVE CONFIG · same recorded multi-GNSS epoch
CONSTELLATION
DAY / NIGHT TERMINATOR sub-solar point off
TLE · CELESTRAK
IONEX · VERTICAL TEC
TRACK CLEANUP · LIVE PHONE DRIVE NET 0
REAL WASM TRACKFILTER · PER-EPOCH REPLAY
Fixes arrive with covariances; wide-covariance fixes get almost no weight, so spikes cannot pull the track.
STATEPAUSED
PROGRESSloading track…
3D ERROR VS SPAN TRUTH
GSDC · 2020-05-14-US-MTV-1 · Pixel4 · SPAN truth · CC BY 4.0 attribution
RTK - MILLIMETER BASELINE, CLIENT-SIDE NET 0
FLOAT · PER EPOCH FIXED TRUTH
WTZR / WTZZ · 40 EPOCH RINEX + SP3
Parsed, differenced, floated epoch by epoch (the teal path is the float estimate converging on truth), then wide-lane fixed by the WASM engine in this tab.
IDLE
BASELINEwaiting
ERROR VS ITRF TRUTHwaiting
RATIOwaiting
WALL CLOCKwaiting
FLOAT TO WIDE-LANE FIXED
IGS MGEX / EPN WTZR-WTZZ 2020-06-25 trims · GFZ SP3 · public IGS data attribution
Drag to orbit · + / − to zoom · click the globe to set an observer
ASTRODYNAMICS · INTERACTIVE
Drive the engine yourself.
Three more calculations, each run live in this tab against the real constellation: a global coverage map, a close-approach screen between any two satellites, and orbit determination from three position sightings. All client-side, zero server calls.
COVERAGE · SATELLITES IN VIEW NET 0
VISIBLE-SATELLITE COUNT ACROSS THE GLOBE · NOW
grid idle
ELEVATION MASK 10° a satellite counts only above this elevation
CONJUNCTION · CLOSEST APPROACH NET 0
SCREEN ONE SATELLITE AGAINST THE WHOLE CONSTELLATION · ONE BATCHED CALL
pick a satellite and screen it against the fleet
IOD · ORBIT FROM THREE POSITIONS NET 0
GIBBS RECOVERY · RECOVERED VS TRUE ORBIT
SIGHTING SPACING 10 min three positions sampled this far apart
pick a satellite and recover its orbit
LANGUAGE INTERFACES
One engine, five languages.
The same reference-validated core, reachable as idiomatic code in Python, C, JavaScript/WebAssembly, Elixir, and Rust. No reimplementations, no drift between bindings: one solve path, verified once, everywhere you call it.
CAPABILITIES
A full GNSS and astrodynamics stack.
From a raw element set to a precise position, sidereon covers the working surface of modern satellite navigation and orbital mechanics in one consistent engine.
VALIDATION
Checked against Vallado, Skyfield, IGS, and IERS.
Every subsystem is verified against the reference implementation for its domain, and where that reference is open, sidereon ships the parity trace.