CHICAGO — Measurement Quantization represents vacuum light speed through the ratio of its fundamental length and time references. Equal light-displacement and elapsed-time counts preserve that reference speed for any selected comparison interval. The International System of Units value remains exactly 299,792,458 metres per second.

Jody A. Geiger’s Measurement quantization, published January 25, 2023 in the International Journal of Geometric Methods in Modern Physics, provides the consolidated historical source. Its speed expression allows equal length and time counts of one, two or any common positive scale. Equal counts therefore establish a ratio; they do not, on their own, identify a unique smallest physical length or time.

In the current motion construction, an observed object and light are compared over one common elapsed interval. Dividing the object’s displacement count by light’s displacement count gives the object’s speed as a fraction of vacuum light speed. Figure 1 separates the interval, the ratio and their interpretation.

For example, a window containing 100 fundamental-time counts has 100 corresponding light-displacement counts under the reference convention. An object displacement count of 25 gives one-quarter of light speed. Doubling the window at that constant speed gives 200 light counts and 50 object counts, preserving the same ratio. These integers illustrate the construction; they are not measurements of microscopic trajectories.

The reciprocal of fundamental time has units per second and specifies a rate. An elapsed-time count is dimensionless and requires a stated duration. A one-second normalization can make their numerical coefficients coincide, but it does not make a count rate and an accumulated count the same physical quantity. Light’s displacement count is fixed within a selected comparison, rather than being one universal integer for every experiment.

Current terminology distinguishes the Internal Frame, the discrete configuration domain, from the System Frame, its realized continuous relational encoding through the Frames mapping. A diagram of count increments is not evidence of tiny rods, clocks or a physical lattice existing inside the primitive count domain.

This result explains how MQ keeps its references consistent with a defined speed. It is not a new measurement of light speed, an independent validation of discrete spacetime or a derivation of all relativistic transformations. The companion technical Brief supplies the exact relations, worked count and SI examples, practical measurement context and the separate assumptions needed for the wider motion treatment.

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