Speed of light according to Rig-Veda 

The speed of light, (defined as 299 792 458metres/s) is a universal constant which was often believed to be impossible to breach. However it is now known that the speed of light is approximately 304,463.2 km/sec.The simplest and most successful attempt to measure the speed of light was performed by Max Planck, Different physicists have tried to measure the speed of light throughout history.