fɔːɹ dˈɛkeɪdz, ɪɾ ˈɔːlsoʊ sˈɜːvd æz ðɪ əfˈɪʃəl tˈaɪmkiːpɪŋ stˈeɪʃən fɚðɪ ɛntˈaɪɚ bˈeɪ ˈɛɹiə, mˈɛʒɚɹɪŋ tˈaɪm wɪð ɪts tɹˈænsɪt tˈɛlᵻskˌoʊp.
For decades, it also served as the official timekeeping station for the entire Bay Area, measuring time with its transit telescope.