The length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second

by Quince Vaughan November 17, 2018

Meters-

A metre (m), also spelled meter, in measurement, fundamental unit of length in the metric system and in the International Systems of Units (SI). It is equal to approximately 39.37 inches in the British Imperial and United States Customary systems. The metre was historically defined by the French Academy of Sciences in 1791 as 1/10,000,000 of the quadrant of the Earth’s circumference running from the North Pole through Paris to the equator. The International Bureau of Weights and Measures in 1889 established the international prototype metre as the distance between two lines on a standard bar of 90...

- Encyclopædia Britannica

A metre (m), also spelled meter, in measurement, fundamental unit of length in the metric system and in the International Systems of Units (SI). It is equal to approximately 39.37 inches in the British Imperial and United States Customary systems. The metre was historically defined by the French Academy of Sciences in 1791 as 1/10,000,000 of the quadrant of the Earth’s circumference running from the North Pole through Paris to the equator. The International Bureau of Weights and Measures in 1889 established the international prototype metre as the distance between two lines on a standard bar of 90...

- Encyclopædia Britannica

by Miskatonic Jack 2 November 20, 2010

by Belinda h. December 07, 2003

by Denozzo August 03, 2008

by Philip Stephenson November 30, 2004