Secor (interval)

7-limit 8:7 septimal whole tone  Play 8:7  Play two secors.

In music, a secor is the interval of 116.7 cents  Play named after George Secor, discoverer of miracle temperament.

It is approximated in 31  Play, 41  Play, and 72 equal temperament  Play. For tuning purposes, a secor of seven steps of 72 equal temperament is often used.

Two secors (233.4  Play) approximate an 8:7 interval (231.17), a septimal whole tone. Three of these 8:7 intervals (693.51), or six secors (700.2  Play), approximate a fifth (701.96). A neutral third of 11:9 (347.41) is approximated by three secors (350.1  Play).

Miracle temperament, particularly in the distributionally even scale known as Blackjack, a scale of twenty-one notes derived from twenty successive secors, has been used by several composers, including New York composer Joseph Pehrson.

External links

• http://tonalsoft.com/enc/s/secor.aspx