Summary

The General Conference of Weights and Measures established 299,792.458 kilometers as the speed of light in reference material for 21 October 1983, marking a significant milestone in international science. This precise value is widely recognized globally and serves as a fundamental constant for physics calculations. However, as of today, the actual measured speed of light varies widely depending on the experimental environment and instrument used, with recent measurements ranging between 299,792.457 and 299,792.458 kilometers per second. Understanding the historical precision of these values is crucial for accurate scientific research and engineering applications in fields ranging from basic research to high-end technology.

Title

Home - Day of Photonics

Description

Home - Day of Photonics

Keywords

contact, october, partners, home, registration, google, industry, privacy, policy, menu, cookies, website, general, conference, weights, measures, value

NS Lookup

A 31.24.159.135

Dates

Created 2026-03-09

Updated 2026-04-21

Summarized 2026-04-21