quindecile
/kwɪnˈdɛsʌɪl/ /kwɪnˈdɛsɪl/Astrology and Astronomy
adjective
Designating the aspect of two celestial objects which are one fifteenth of a circle (24 degrees) apart in the sky.
Origin
Late 17th century; earliest use found in Joseph Moxon (1627–1691), printer and globe maker. From post-classical Latin quindecilis from classical Latin quīndecim fifteen + -īlis.