Decumbiture

Definition

Decumbiture is a horary chart cast for the moment a sick person takes to bed with illness. The name comes from Latin decumbo ("to lie down"); the Greek equivalent is kataklinō (κατακλίνω), also "to lie down at the sickbed." Holden defines it directly: a horary chart set for the time certain when someone took to bed because of illness, used to make a diagnosis and prognosis. The technique sits at the meeting point of horary astrology and medical practice. In the Renaissance European medical curriculum — many universities of the fifteenth and sixteenth centuries taught astrology as part of the medical degree — the decumbiture chart was the usual practice for any astro-medical inquiry. The Hellenistic foundation is Hephaistio's Apotelesmatica Book III, where chapter 31 systematically deploys decumbiture doctrine through schemata of critical days (3, 4, 9, 14, 21) and per-body-part sign rulership.

In Tradition

In the Hellenistic and traditional schools the decumbiture is read through the standard horary apparatus, modified for the medical question. The astrologer cast the chart for the moment the patient took to bed, then read the Ascendant and its lord for the patient, the sixth house and its lord for the illness, the seventh for the physician, and the tenth for the medicines. The critical-days schema — derived from the Greek krinō ("to judge, to decide"), whose participle gives "critical" — picks out days at which the prognosis can be judged. Galen wrote a treatise on the same medical-day tradition, De Diebus Decretoriis ("On Decisive Days"), and the Galenic medical synthesis is what carries decumbiture from the Hellenistic into the medieval Arabic and Latin Renaissance practice.

In Practice

Because decumbiture is medical-astrological technique, the modern reading respects two boundaries. First, the historical practice: it required precise time-keeping (the exact moment the patient first took to bed) and an astrologer-physician with the training to read the chart against the patient's constitution and the illness's suspected source. Second, the modern caveat: the doctrine is preserved as scholarly category, not as a substitute for contemporary medical care. With those framings in place, the chart is read for clues about the source and probable course of the illness, the patient's strength to resist it, and the medicines or interventions traditionally indicated by the planet ruling the affliction. Argoli's De diebus criticis et de aegrotorum decubitu (1639, 1644) is the canonical Renaissance treatise on critical days and the decumbiture of the sick. The technique faded with the late-sixteenth- and seventeenth-century turn against astrology and the accumulation of empirical medical knowledge, but is preserved in the modern traditional revival as a historical chapter of horary practice.

Historical Origin

Decumbiture is canonical Hellenistic-through-Renaissance medical-astrology doctrine. Hephaistio III.31 is the foundational primary-source chapter — Gramaglia's editorial footnote at that passage names the genre (Latin decumbo, Greek kataklinō) and the related Greek krinō / krisis ("judgment, decision") tradition that becomes the Latin "critical days." Holden traces the practice through Valens' Books VIII-IX and into the medieval Arabic-Latin medical-astrology corpus, with Argoli's seventeenth-century treatise as the canonical Renaissance handbook. The 15th-16th-century European medical curricula that included astrology for diagnosis, prognosis, and medicine selection treated the decumbiture as the usual practice for such inquiries. The doctrine connects to broader Hippocratic critical-days tradition through Galen's synthesis.

Etymology

Origin: Latin (translating Greek). Meaning: A taking to bed; the moment of falling ill.

Further Reading

• James H. Holden, A History of Horoscopic Astrology
• H. L. Cornell, Encyclopedia of Medical Astrology
• John Frawley, The Horary Textbook