More from Gravity & Orbits
Other simulators in this category — or see all 27.
Shapiro Time Delay (4th GR Test)
A radio signal grazing the Sun picks up an excess one-way travel time Δt ≈ (2GM/c³) ln[(r_E + r_E cos α)(r_R + r_R cos β)/b²] on top of the Newtonian light-time. Cassini, Mariner and Viking presets, with the round-trip delay readout in microseconds and an animated bent-photon path against a straight Newtonian baseline. The Cassini 2003 conjunction constrains |γ_PPN − 1| < 2 × 10⁻⁵ — the strongest weak-field GR test to date.
Three-Body Figure-Eight
Equal masses: Chenciner–Montgomery choreography in 2D (RK4, periodic orbit).
Restricted 3-Body (map)
CRTBP: escape vs collision vs chaos proxy; μ slider.
Multistage Rocket (Tsiolkovsky)
Δv per stage; sum vs single-stage with same total propellant.
Orbital Debris & Kessler (toy)
LEO shell: n = N/V, collision rate ∝ N²; optional fragment cascade.
Gravity-Assist Fly-By
Planet frame |u_out|=|u_in| rotated by δ; star frame v = V + u — Δ|v| from moving planet.