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Convert light speed (vacuum) to centimeter/year
Selected category: speed.
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.
Definition and details for centimeter/year:
Centimeter per year (based on Julian year, exactly 365.25 days) is a unit of velocity equal to about 3.17x10-10 m/sec. This unit could be usefull for those who study tectonic phenomena.

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