20/9: Difference between revisions
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{{Infobox Interval | {{Infobox Interval | ||
| Name = Ptolemaic ninth | | Name = Ptolemaic ninth | ||
| Color name = y9, yo 9th | |||
}} | }} | ||
'''20/9''', the '''Ptolemaic ninth'''; the ratio between the 20th and 9th harmonics; one octave above [[10/9]]. | '''20/9''', the '''Ptolemaic ninth'''; the ratio between the 20th and 9th harmonics; one octave above [[10/9]]. | ||