Relativity Park - Walk through a world where light moves at 5 km/h
Show HN: What if the speed of light was 5 km/h?
Relativity Park is a WebGL 2 simulator that makes Einstein's special relativity tangible by slowing the speed of light to a walking pace. Explore a park where lamp posts flash in slow motion, a Ferris wheel spins at 75% of c, and a shuttle contracts as it moves. Toggle light-travel delay, aberration, Doppler color, and relativistic beaming to see each effect in isolation. The physics is accurate, and the experience is eye-opening. Created by Dmitry Brant.
All of the motion effects you see are physically accurate, in a world where the speed of light is greatly reduced, so it can be observed more easily on human scales.