ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
θεῖτο: γʹ ενικ. ευκτ. Μέσ. αορ. βʹ του τίθημι.