Word origin · etymology
Greek aphetes, a releaser, from aphienai, to send forth.
Merriam-Webster's entry, read here only through a search summary, derives apheta from the Greek aphetes, a heavenly body determining the vital quadrant, from aphienai, to send forth (apo, from, and hienai, to send). The word came into English astrology through New Latin apheta.
Merriam-Webster, apheta (read here only through a search summary) ↗Vettius Valens, Anthologies, translated by Mark Riley: Book III chapter 1 (the control and the apheta), Book VI chapters 5K;6P to 7 (the decennials) and the Book IX fifth-century addition ↗
How we know · epistemology
Ancient technical term used in more than one technique
Valens uses apheta for the starting point of the 129-month sequence (VI.5K;6P, VI.7) and, in Book III chapter 1, for the point from which the length of life is reckoned; Riley's marginal note says the controller is one thing, the houseruler another and the apheta another. The decennials tool uses the first sense only, and which star is the apheta rests on a test of how well the luminaries are placed that the tool does not apply.
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