zenith: [14] Arabic samt arrās means literally ‘path over the head’. Samt ‘path, road’ made its way via Old Spanish zenit and Old French cenit into English as zenith, bringing with it the metaphorical application to the ‘point in the sky directly overhead’. The plural of samt, sumūt, is the ultimate source of English azimuth [14]. => azimuth[zenith etymology, zenith origin, 英语词源]