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Originally Posted by Gem
We measure time by counting the number of such oscillations. Hence we can objectively measure duration by counting 'beats'.
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This was basis for first ammonia atomic clock and was based on one atom oscillating back and forth between three others ergo a tetrahedral inside-outing and then back, process.
..."vibrations of excited ammonia molecules. The ammonia molecule (NH3) consists of
a pyramid --{ tetrahedron }-- with a nitrogen atom at the apex and one hydrogen atom at each corner of the triangular base."...
http://www.oxfordreference.com/view/...10803095408923
And in more recent times a tetrahedral arrangment of laser beams are used.
https://ieeexplore.ieee.org/document/351870/