The spelling of "were the horizon" follows standard English spelling rules. The word "were" is spelled with a silent "w" and has a schwa sound /wə/ followed by the consonant sound /r/. The word "the" is spelled with the voiced dental fricative /ð/ followed by the schwa sound /ə/. Finally, the word "horizon" is spelled with a silent "h" and has the vowel sound /ɒ/ followed by the consonant sounds /r/, /ɪ/, and /z/. Overall, the spelling of "were the horizon" accurately reflects the pronunciation of this phrase.