A Group of aspects, introduced by Kepler, based on a division of one-fifth of the circle. They have had limited adoption, and their value is chiefly in directions. They are:
Bi-Quintile…………………… 144°
Tridecile…………………….. 108°
Quintile (one-fifth of 360°)……. 72°
Decile or Semi-Quintile………… 36°
Quindecile……………………. 24°
Semi-Decile, or Vigintile………. 18°
DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.