The page hosted at rivendell.dmitrybrant.com/relativity/ presents an interactive visualization of special relativity in which the speed of light is set to five kilometres per hour – roughly the pace of a brisk walk. According to the source, the environment is described as a park where this reduced light speed makes relativistic phenomena noticeable at everyday velocities. Users can move through the scene using the W, A, S and D keys to accelerate, while the mouse controls the direction of view. Pressing the space bar stops motion, and the keys L, G, C and B toggle various visual effects such as length contraction, time dilation, Terrell rotation and the Doppler shift. Pressing R resets the simulation to its initial state. As the user’s speed increases relative to the lowered light speed, the page notes that objects ahead become blueshifted, objects behind become redshifted, and transverse Doppler effects appear on moving objects to the side. The simulation also demonstrates length contraction, where objects appear shortened in the direction of motion, and time dilation, which is illustrated by clocks that tick more slowly relative to a stationary observer. These effects are presented as they would be observed if light traveled at only five kilometres per hour, making the normally imperceptible relativistic changes visible at walking speeds. The interactive nature of the demo allows users to experiment with acceleration and observe the immediate visual feedback of each relativistic effect. By anchoring the speed of light to a familiar, slow pace, the page offers an intuitive way to explore concepts that usually require velocities approaching the actual speed of light. The source does not provide any additional context about the creators, the intended audience, or any scientific validation beyond the description of the visual effects and controls. The presentation remains focused on the interactive experience and the observable outcomes of altering the universal constant c in the simulation.
Key facts
- The simulation sets the speed of light to 5 km/h.
- Controls: W/A/S/D accelerate, mouse look, space stop, L/G/C/B toggle effects, R reset.
- Observed effects include length contraction, time dilation, Terrell rotation, blueshift ahead, redshift behind, and transverse Doppler shift.
- The environment is described as a park where the reduced light speed makes relativistic phenomena noticeable at walking speeds.