SI OFFICIAL LABORATORY MEASUREMENT IN A VACUUM
10% of the speed of light: 29,979,245.8 m/s
From Notation 1 to 202 (that is from the first moment of time to the current time), the simple calculation, c = ℓP ÷ tP, renders a variable speed of light, all well within .1% of the laboratory value. To explore those numbers, see line 10 within our horizontally-scrolled chart.
Planck Length divided by Planck time equals 299,792,434.14 meters/second.
From the Planck units, the difference is just 35 meters/second, less than .0001% difference from the current SI standard rating in 2019. In the following notations the fastest interval is within Notation 16 where it is at 299,982,157.27 meters/second. The slowest calculation is within notation 76 which is 299,759,426.55 meters/second. The difference from the fastest to the slowest is 222,720.72 m/s. From the fastest interval there is a 189,699.27 m/s difference. From the slowest interval, there is just 33,031.45 m/s difference.
299,774, 296.4 meters/second
“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 299,792,422.79 meters/second.”
Max Planck’s calculation of Planck Time and Planck Length gave him the most accurate measurement of the speed of light with the smallest possible statistical error at the earliest possible date, 1899.