Convert **light speed (vacuum)** to **centimeter/hour (cm/h)**

Selected category: speed.

Speed of light (c) in vacuum is equal to 299 792 458 meters/sec with a relative measurement uncertainty of 4 parts per billion. Up to 17^{th} century humanity wasn't sure if light was transmitted instantaneously or simply very quickly. The Danish astronomer, Ole Christensen Rømer first demonstrated that light travelled at a finite speed when he studied the apparent motion of Jupiter's moon Io.

Centimeter per hour (cm/h) is a unit of velocity equal to about 2.778x10^{-6} m/sec.

Swap, do a centimeter/hour (cm/h) to light speed (vacuum) conversion.