Perihelion: Orbital Game

Pilot a spacecraft through 8 hand-crafted orbital mechanics missions Pilot a spacecraft through 8 hand-crafted orbital mechanics missions - all powered by a live N-body gravity simulation using Velocity Verlet integration.

Every burn matters. Fuel is finite. The universe does not care about your intentions.

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8 MISSIONS
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Training - Learn the controls: fly through 5 gate checkpoints around Earth.

Lunar Orbit - Launch from Earth and achieve a stable orbit around the Moon.

Rendezvous - Dock with a moving space station by matching its velocity precisely.

Jupiter Grand Tour - Orbit Io, Europa, and Ganymede - three separately stable orbits in one mission.

Planetary Defense - Intercept an inbound asteroid and thrust it off its collision course with Earth.

Perihelion - Burn deep into the inner solar system and fly through the Sun's gate at closest approach.

Nebulon 5 - Thread through five massive plasma nebulas (instant death on contact) and dock with the gold asteroid at the centre.

Three Body Problem - Navigate three mutually orbiting suns evolving in real-time chaotic N-body motion.

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FEATURES
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* Live N-body gravity simulation - Velocity Verlet integration
* Live trajectory prediction - 500-step lookahead updates in real time
* Time warp - 1x, 2x, 4x, 10x, 50x with sub-stepped physics
* Three flyable spacecraft - Dart, Vanguard, and Atlas
* Per-ship personal best times for every mission
* Procedural planetary rendering - atmospheric glow, limb darkening, solar corona
* Plasma nebula renderer - organic blob shapes with Hubble-style textures
* No ads. No in-app purchases. No internet connection required.