ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
dat. sg. de ὄψις;2ᵉ sg. att. de ὄψομαι.
ὄψει: I dat. к ὄψις.II ион.-атт. = ὄψεαι.