Convert knot (kn or kt) to light speed (vacuum)
Selected category: speed.
Definition and details for knot (kn or kt):
Knot (kn or kt) is a velocity unit used to express speeds at sea. Knot is equal to 1 nautical mile per hour or 1852 meters per hour.
Definition and details for light speed (vacuum):
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 17th 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.