Hyleg

Definition

The hyleg is a point in the birth chart, chosen by rules of sect and placement, that is read as the "releaser" of life — the focal point classical and medieval astrologers used in longevity calculations. There are five possible candidates for it, drawn from Hellenistic doctrine and set down in the Persian-Arabic tradition: the Sun, the Moon, the Lot of Fortune, the Ascendant, and the degree of the prenatal syzygy — the New or Full Moon just before birth. The Greek term aphetēs means "releaser"; the Arabic hīlāj comes from Middle Persian haylāj, "prorogator."

In Tradition

In Hellenistic and medieval Arabic-Persian astrology, the hyleg is the chief significator of life: its condition, the planets that aspect it, and the directions made to it govern the whole longevity reading. The way it is chosen depends on sect — in a day chart the Sun is examined first, in a night chart the Moon — and if the first candidate fails the placement tests, the choice falls through to the other luminary, then the Lot of Fortune, then the Ascendant, and finally the prenatal syzygy.

In Practice

You follow the cascade described in Dorotheus' Carmen Astrologicum Book III §§8-27, which is also Masha'allah's five-candidate scheme. Weigh the primary luminary by sect, check that it sits in a hylegiacal place — usually the 1st, 10th, 11th, 7th, or 9th house, with variations by author — and check that it is in its own light rather than lost in the Sun's rays. If the primary luminary qualifies, it becomes the hyleg; if not, the cascade moves on to the other luminary, then the Lot of Fortune, then the Ascendant, and finally the prenatal syzygy. Once the hyleg is fixed, the planet with the strongest essential dignity at the hyleg's degree becomes the alcochoden (kadhkhudhāh, the "giver of years"), and the longevity calculation goes on by directing the hyleg forward through the bounds and toward the rays and bodies of the malefics. The modern traditional revival uses all of this as a framework for reading vitality rather than a literal lifespan calculator.

Historical Origin

The hyleg doctrine descends from Ptolemy's Tetrabiblos III.10-11 (c. 150 CE) and Vettius Valens' Anthologiae (c. 145-175 CE) under the Greek term aphetēs. The selection cascade is fully systematized in Dorotheus of Sidon's Carmen Astrologicum Book III (1st century CE) and developed through the Persian-Arabic stream — Masha'allah's five-candidate scheme, 'Umar al-Tabari, al-Biruni's Kitab al-Tafhim (1029), and Bonatti's Liber Astronomiae (c. 1277). It enters the medieval Latin West keeping the Arabic name hīlāj.

Etymology

Origin: Arabic/Persian/Greek. Meaning: Prorogator, releaser, giver of life.

Further Reading

• Dorotheus of Sidon, Carmen Astrologicum
• Al-Biruni, Kitāb al-Tafhīm
• Benjamin N. Dykes, Persian Nativities (Vol I)