🕰️ Light-Delay Clocks and Messages: 2D Plan and Spacetime Diagram

Interactive 2D model of messaging across time: Earth pings three probes moving at different fractions of light speed, and you watch the light fronts, time-dilated probe clocks, delayed replies and out-of-order arrivals on a plan view plus a live spacetime diagram, with draggable probes and the same finite-speed-of-light and Lorentz time-dilation equations as the 3D version.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install