Part of Death

Definition

The Part of Death is one of the Arabic Parts — calculated points, also called Lots — listed in the medieval Arabic and Latin lot-corpus, traditionally used to study length of life and the indicated manner or setting of death. In the Bonatti and Lilly line the usual formula is Ascendant + 8th-house cusp − Moon, with the day/night reversal applied by some authorities. It is read as a derived significator that sharpens an analysis already grounded in the 8th house and life-length work — not as a stand-alone predictor of fate.

In Tradition

In medieval Arabic-Persian and Latin practice the Part of Death is just one entry among the many topical Lots organised by Abu Ma'shar and Al-Biruni. Its sign, house, sign-ruler, and the aspects it receives from malefics or benefics are read together with other 8th-house testimony when judging length of life. Bonatti and Lilly are firm that no single Part should settle so grave a question on its own — the standard rule is that a length-of-life judgment needs several corroborating testimonies.

In Practice

You compute the Part by formula — most often Asc + 8th cusp − Moon, with the day/night reversal in some authorities, and Bonatti and Lilly preserve variant formulas. The resulting degree is then read by its sign, house, and sign-ruler. The condition of that ruler — its essential and accidental dignity (inborn strength and strength of placement), its sect, whether it is free of combustion, whether it sits on an angle — gives the main diagnostic. Affliction from the natural malefics, Mars and Saturn, whether by aspect or by sharing a sign, weighs heavily; benefic aspects soften it. The Part is always consulted alongside the hyleg and alcocoden — the classical length-of-life significators — and the ruler of the 8th house, never on its own. Modern ethical practice usually keeps its use to scholarly study, or to cases where the person raises the subject themselves, rather than routine reading.

Historical Origin

The Part of Death is listed in the medieval Arabic Lot-corpus set in order by Abu Ma'shar in his Great Introduction (9th c., Part VIII) and by Al-Biruni in Kitab al-Tafhim (c. 1029, sections 475-480). It passed into the Latin tradition through Bonatti's Liber Astronomiae (13th c., Tractate II) and was codified for English horary in William Lilly's Christian Astrology (1647). Holden's history survey notes the Part's unbroken documentation from antique to early-modern sources.

Further Reading