συγκέντρωσις
Ὥσπερ αὐτοῦ τοῦ ἡλίου μὴ ὄντος καυστικοῦ, ἀλλ' οὔσης ζωτικῆς καὶ ζωοποιοῦ θέρμης ἐν αὐτῷ καὶ ἀπλήκτου, ὁ ἀὴρ παθητικῶς δέχεται τὸ ἀπ' αὐτοῦ ϕῶς καὶ καυστικῶς· οὕτως οὖν ἁρμονίας οὔσης ἐν αὐτοῖς τινὸς καὶ ἑτέρου εἴδους ϕωνῆς ἡμεῖς παθητικῶς ἀκούομεν → Just as although the Sun itself does not cause burning but has a heat in it that is life-giving, life-engendering, and mild, the air receives light from it by being affected and burned, so also although there is a certain harmony and a different kind of voice in them, we hear it by being affected.
English (LSJ)
εως, ἡ, Astron., A a simultaneous relation of centres, i.e. when the sun's centre is at that point of the ecliptic which rises, sets, or culminates coincidently with the rising, etc., of a given star, Ptol.Alm.8.5 (pl.).
Greek (Liddell-Scott)
συγκέντρωσις: -εως, ἡ, ἀστρονομικὸς ὅρος παρὰ Πτολ., ὅστις ἑρμηνεύεται ὡς σημαίνων τὴν σύγχρονον σχέσιν τῶν κέντρων.