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'''15625/15309''' | '''15625/15309''', the '''Arcturus comma''', is a no-2s [[7-limit]] ([[3.5.7 subgroup|3.5.7-subgroup]]) comma of about 35.4{{c}} in size. It is named as such because it is tempered out by the [[Arcturus]] temperament. It factors in the no-2s 7-limit as ([[245/243]])⋅([[3125/3087]]), and tempering both of these out leads to [[13edt]], or the equal-tempered [[Bohlen-Pierce]] scale. | ||
It is a [[ragisma]] sharp of [[50/49]], and a [[landscape comma]] sharp of [[49/48]]. It is extremely close to half of [[25/24]], with two instances of this comma exceeding 25/24 by the [[euzenius comma]] of 0.07{{c}}. | |||
[[Category:Commas named for their regular temperament properties]] | |||