ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
(Α ἀμοιβαδὸν) επίρρ. ἀμοιβήαμοιβαία, εναλλάξ, διαδοχικά.