day sect / night sect
Phonetic: /deɪ sɛkt / naɪt sɛkt/
In Medieval astrology, day sect and night sect refer to the division of planets into diurnal and nocturnal groups according to whether a chart occurs by day or by night.
This doctrine was inherited from Hellenistic astrology and remained central in Medieval planetary judgment. Sun, Jupiter, and Saturn belong to the day sect, while Moon, Venus, and Mars belong to the night sect. Mercury participates in either sect depending on its position relative to the Sun. A planet operating within its proper sect was considered more balanced and effective, while one outside its sect could act with greater difficulty or excess.