Orbital Data

Distances: NASA Planetary Fact Sheet (AU values, ±0.01 AU)

Periods: JPL Horizons database (real sidereal periods)

Eccentricities: Real values (Mercury 0.2056, Earth 0.0167, etc.)

Axial tilts: IAU 2009 values (Earth 23.44°, Uranus 97.77°)

Rendering Accuracy

Planet sizes: correct ratios (not to-scale with distances)

Distance scale: 1 AU = 50 units (compressed for visibility)

Orbit shapes: elliptical (Kepler's first law)

Starting positions: randomized (not epoch-accurate)

Live Data

ISS: api.open-notify.org (real lat/lng, ±0.1°, 30s refresh)

Position mapping to 3D scene is approximate

What's NOT Accurate

Star positions are procedural (not real catalog)

Planet textures are solid colors (not NASA imagery)

No gravitational perturbations between planets

No precession of orbits

Lagrange points simplified (L1/L2 at ±1% of Earth orbit)

Tech

Three.js r128, WebGL, 45KB, 0 external deps