Sect
Sect is the condition that divides a chart into diurnal or nocturnal according to whether the Sun was above or below the horizon at birth, and splits the seven planets into two sides that work better or worse depending on which one they belong to.
It is one of the keys of Hellenistic astrology, and one of the most thoroughly lost: much of twentieth-century astrology ignored it entirely. Recovering it changes whole readings.
The idea is simple and the consequences are large: the same planet, in the same position, behaves differently depending on whether the chart is of the day or of the night.
What it reveals
Which of the two luminaries is in charge. In a diurnal chart the Sun leads and orders the reading; in a nocturnal one, the Moon.
Which benefic is at its best: Jupiter by day, Venus by night. The one on duty gives more, and at less cost.
And above all, which malefic is tempered and which is out of hand. Saturn belongs to the diurnal side and Mars to the nocturnal one: each behaves better in sect and hardens out of sect. A Mars in a diurnal chart is a different animal from a Mars in a nocturnal one.
Why it matters so much
Because it is the difference between reading seven loose planets and reading a system with sides. Without sect, Saturn is always “the greater malefic”; with sect, it is a planet that in half of all charts is on your side.
The tradition adds finer conditions—hayz and halb, which combine sect with hemisphere and sign—that refine the judgment further still.
Frequently asked questions
What is sect in astrology?
It is the condition that divides a chart into diurnal or nocturnal according to whether the Sun was above or below the horizon at birth. It splits the seven traditional planets into two sides, and each one works better when the chart belongs to its sect.
How do I know whether my chart is diurnal or nocturnal?
It depends on whether the Sun was above the horizon—between sunrise and sunset—or below it at the moment of birth. It is diurnal in the first case and nocturnal in the second.
Which planets belong to each sect?
The diurnal side comprises the Sun, Jupiter, and Saturn; the nocturnal one, the Moon, Venus, and Mars. Mercury is variable: it aligns with one side or the other depending on which side of the Sun it stands on.