Farḥ al-Kawkab (Planetary Joy, Four Kinds)
Definition
Farḥ al-kawkab is the medieval Arabic doctrine of planetary joy as Sahl ibn Bishr systematizes it into four distinct kinds, expanding the single Hellenistic house-joy scheme. A planet rejoices first by house (Mercury in the 1st, Moon 3rd, Venus 5th, Mars 6th, Sun 9th, Jupiter 11th, Saturn 12th); second by sitting in its own domicile of matching sect (Saturn in Aquarius, not Capricorn); third by rising appropriately to its sect (diurnal planets rising eastern at morning, nocturnal appearing western at evening); and fourth by occupying a quadrant of matching gender.
In Tradition
Arabic-Persian practitioners read joy as accidental strength that lets a planet express its nature freely, and Sahl's contribution is to recognize that joy operates on four independent axes at once rather than one. A planet satisfying more of the four kinds is read as more comfortable and effective. The sect-modulation rule is the distinguishing refinement: the planets ruling two signs take their domicile-joy in the sign agreeing with their own day or night character, which simpler joy schemes leave unstated.
In Practice
Test each planet against the four kinds in turn. First, check the house-joy table: a planet in its joy-house gains strength fitting the house topic, so Saturn in the 12th, though cadent, reads as more at home in restriction and hidden labor. Second, check sect-domicile: each planet joys in one assigned domicile — Saturn in Aquarius (not Capricorn), Jupiter in Sagittarius, Mars in Scorpio, Sun in Leo, Venus in Taurus, Mercury in Virgo, Moon in Cancer — the two-domicile planets taking the sign that agrees with their sect. Third, check rising: a day planet appearing in the east at morning, or a night planet in the west at evening, rejoices by being in its sect's preferred phase. Fourth, check the quadrant: Saturn, Jupiter, and Mars rejoice in the masculine quadrants (Midheaven-to-Ascendant and IC-to-Descendant), the Moon and Venus in the feminine, and Mercury in either. Count how many kinds each planet satisfies, weigh that against its dignity and aspects, and read joy-rich planets as the chart's freely operating significators.
Historical Origin
The four-kind scheme is set out by Sahl ibn Bishr in his Introduction to Astrology, in the chapter on the joys of the planets (early 9th century), where the house-joy table appears first. The wider doctrine descends from the Hellenistic house-joys, which Sahl consolidates with sect-domicile, rising, and hemisphere joy. It is preserved in Benjamin N. Dykes's translation Works of Sahl & Masha'allah (2008) and entered the Latin West chiefly through the house-joy map.