What is septimal comma?

Septimal Comma

A septimal comma is a small musical interval in just intonation that contains the number seven in its prime factorization. There is more than one such interval, so the term septimal comma is ambiguous, but it most commonly refers to the interval 64/63 (27.26 cents).

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Some articles on septimal comma:

Septimal Comma - Summary
... Ratio Size in cents Names 64/63 27.3 Septimal comma, Archytas' comma 50/49 35.0 Septimal sixth-tone, tritonic diesis, Erlich's decatonic comma 49/48 35.7 Slendro diesis 36/35 48.4 ...

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    From one casual of mine he picked this sentence. “After dinner, the men moved into the living room.” I explained to the professor that this was Ross’s way of giving the men time to push back their chairs and stand up. There must, as we know, be a comma after every move, made by men, on this earth.
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