_ratio.scss

// Musical intervals
$octave:            2;     //  2:1
$major-seventh:     1.875; // 15:8
$minor-seventh:     1.778; // 16:9
$major-sixth:       1.667; //  5:3
$minor-sixth:       1.6;   //  8:5
$perfect-fifth:     1.5;   //  3:2
$diminished-fifth:  1.414; // √2:1
$augumented-fourth: 1.414; // √2:1
$perfect-fourth:    1.333; //  4:3
$major-third:       1.25;  //  5:4
$minor-third:       1.2;   //  6:5
$major-second:      1.125; //  9:8
$minor-second:      1.067; // 16:15
$unison:            1;     //  1:1

// Metallic means
$golden-ratio:      1.618; // 1.618033989...
$silver-ratio:      2.414; // 2.414213562...
$bronze-ratio:      3.303; // 3.302775638...