What was the redefinition of the meter?

The meter was redefined in 1983 by the General Conference on Weights and Measures (CGPM) as the distance light travels in a vacuum in 1/299,792,458 of a second. This definition relies on the constant speed of light, which is approximately 299,792,458 meters per second. This shift from a physical artifact to a universal constant was aimed at providing greater precision and consistency in measurements. The redefinition reflects advancements in science and technology, allowing for more accurate and reproducible measurements of length.