Sommerfeld’s fundamental fine-structure constant α once more gives reason to be amazed. This comment is a Chapter of a publication in preparation dealing mainly with golden ratio signature behind
Preston Guynn’s famous matter/space approach. As a result we present a relation of α to the galactic velocity

, mediated by the circle constant
π, which points to an omnipresent importance of this constant and its intrinsic reciprocity pecularity:
α ≈
π2|
βg| respectively

. The designation fine-structure constant should be replaced simply by
Sommerfeld’s constant. We present golden mean-based approximations for α as well as for electron’s charge and mass and connect the word average value of interaction coupling constant
αs(
mz) with |
βg|.