Fī Ḍawʾihi (In Its Own Glow)
Definition
Fī ḍawʾihi, 'in its own glow,' is the Dorothean-Arabic name for a planet that shines properly on its own light — out of the Sun's rays, not combust, and not otherwise dimmed. It marks the positive pole of the visibility conditions: the Arabic ḍawʾ (a planet's own radiance) is set against shuʿāʿ (the Sun's directed beam) that can afflict it. Dorotheus uses the phrase as a delineation-strengthener, noting that a planet in its glow lets the benefics' aspects increase the good it promises and the malefics' aspects diminish it more sharply.
In Tradition
Arabic-Persian practitioners treat a planet's freedom to shine as a real strength that co-varies with, but is distinct from, its relation to the Sun. A planet in its own glow is operationally sound — its significations can be read at face value — whereas one burned under the rays cannot deliver freely. The doctrine pairs the visual-brightness criterion with the elongation-from-Sun criteria used to test a planet's fitness, so a body out of the rays and in its glow counts as fit to act.
In Practice
Before reading a planet's promise, check whether it is in its own glow: confirm it is out of the Sun's rays by the per-planet elongation interval, not within the combustion band, and not otherwise visually weakened. When it qualifies, take its delineation at full strength and let aspects to it carry their normal force — benefics increasing what it signifies, malefics cutting it down. Dorotheus applies this directly in his planet-in-place judgments: the Moon in the Ascendant 'in her glow' lets fortunes' aspects amplify the good; Venus in the Ascendant 'eastern, joyful in her glow' makes the native praised and attractive; Mercury under the earth 'rejoicing in his own glow' yields good intention. Use the condition as a gate — a planet not in its glow is read as muted, its testimony discounted until it emerges from the rays.
Historical Origin
The phrase recurs through Book II of Dorotheus of Sidon's Carmen Astrologicum (1st century CE, surviving via the 8th-century Arabic translation of ʿUmar al-Ṭabarī), recurring through his Book II planet-in-place delineations, where it strengthens the judgment. It belongs to the same Arabic visibility vocabulary as taḥt al-shuʿāʿ (under the rays) and iḥtirāq (combustion). Benjamin N. Dykes renders ḍawʾ as 'glow' in his translation of Carmen Astrologicum.