Al Qalb

Al Qalb is the eighteenth lunar mansion, spanning roughly 218 to 231 degrees within Scorpio, and it contains the red star Antares, the Scorpion's heart. Its name means the heart. Antares is one of the four royal stars of Persian astronomy, and the station carries that weight. In the manazil tradition its planetary ruler is Mars, fittingly, since Antares is the rival of Mars, its red glow resembling the planet, and its traditional talismanic virtue is discord and sedition, a mansion assigned to conflict and the undoing of bonds. Each of the manazil carries a fixed magical property from the Arabic tradition, transmitted through the Picatrix and Agrippa. These are the conventions of that talismanic tradition; the underlying star is Antares, a red supergiant long treated as ill-omened.

Al Qalb's identification of Antares as the Scorpion's heart is one of the oldest attested readings of this star across multiple independent traditions, Mesopotamian, Greek and Arabic alike, and its Arabic epithet as rival of Mars, on account of its ember-red colour, is preserved directly in the Greek name Antares itself, anti-Ares, showing a rare case where the Arabic and Greek fixed-star traditions converged on essentially the same figure of speech for the same star through what appear to be independent routes rather than direct borrowing. As one of the four Persian royal stars, Antares carried a weight in the wider astrological tradition that this single manazil station only partially reflects, its talismanic virtue of discord and sedition drawn from the mansion scheme's own separate logic rather than from the star's broader royal reputation.

Where the zodiac cuts the ecliptic into twelve, the manazil cut it into twenty eight, and the number comes from the Moon's daily motion rather than from any figure in the sky. Each mansion is exactly twelve degrees fifty one minutes wide, one twenty eighth of three hundred and sixty. Al Qalb is the eighteenth of them, running from 8 degrees 34 minutes of Scorpio to 21 degrees 26 minutes of Scorpio. The Moon's mean daily motion of about thirteen degrees eleven minutes is slightly more than one mansion, so it completes the circuit of all twenty eight in the sidereal month of twenty seven and a third days, not in the twenty nine and a half of the synodic month the phases follow.

The Arabic manazil al qamar reached Latin Europe through translation in the twelfth and thirteenth centuries, and the magical use of the mansions travelled with the astronomical scheme rather than after it. Agrippa set out all twenty eight with their degrees and their operations in the second book of the Three Books of Occult Philosophy, and that chapter, not any Arabic original, is where almost every later English language list comes from. Al Qalb is a transliteration, and the spellings vary widely between sources.

There is a problem in those degrees that the printed lists rarely flag. The mansions are named for star groups, but the boundaries above are measured in the tropical zodiac, anchored to the equinox, which drifts against the stars at about one degree every seventy two years. The Arabic scheme was fixed to the stars themselves. Something close to twenty degrees of precession has accumulated since the medieval transmission, so a mansion's tropical degrees no longer contain the stars it is named after. Both readings are in circulation and neither is a misprint.