Four steps of derivation of measurement unit concerning length

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Here are four steps for the derivation of the meter, the standard unit of length:

The concept of length is a fundamental physical quantity that describes the extent of an object or the distance between two points.
To measure it consistently, a standard unit is needed.
Historically, the meter was first defined in 1793 by the French National Convention as one ten-millionth (1/10,000,000) of the distance from the North Pole to the Equator along a meridian passing through Paris.
To provide a more practical and reproducible standard, in 1889, the meter was redefined as the length of a prototype platinum-iridium bar kept at the International Bureau of Weights and Measures (BIPM).
For even greater precision and universality, the meter was redefined in 1983 as the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second.
This definition links the meter directly to the speed of light, a fundamental constant of nature.

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