Planck Base Units: At some point after the base units were first calculated, some mathematician refined those calculations and Planck Length became 1.616255×10^-35 meters and Planck Time became 5.391247×10^-44 seconds. Dividing the two numbers renders 299,792.4228 kilometers per second. That number, of course, is worthy of note. Nobody has claimed it, so we’ll lift it up as an enigma and credit Max Planck for his inspiration.

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“In 1899 Max Planck defined Planck Time as the unit of time (in a system of natural units or “Planck units”) whereby light travels the distance of one (1) Planck length in a vacuum. The calculation, Planck Length divided by Planck time is equal to 300,000,00 meters/second.”

• van Remortel, N., The nature of natural units. Nature Phys 12, 1082 (2016). https://doi.org/10.1038/nphys3950
• Von Kirchoff bis Planck: Theorie der Wärmestrahlung in historisch-kritischer Darstellung, Hans-Georg Schöpf, Springer, 1978.
• Max Planck, Über irreversible Strahlungsvorgänge, Annalen der Physik,1900
• Please note:
  1. This page: https://81018.com/light-stats/ 
  2. https://81018.com/wikipedia-speed-of-light/
  3. https://81018.com/speed-of-light/
  4. https://81018.com/universeclock/