In astrology, the hyleg is the Persian-Arabic term for the planet with the greatest essential dignity in five important natal chart positions :[1] the degree of the Sun the degree of the Moon the Ascendant the Lot of fortune the pre-natal syzygy Wikipedia

In Hellenistic astrology, the planet with the greatest essential dignity in five important natal chart positions: the degree of the Sun; the degree of the Moon; the Ascendant; the Lot of Fortune; and the prenatal syzygy (that is, New Moon or Full Moon, whichever most closely preceded the birth). Wiktionary