The International Bureau of Weights and Measures (BIPM, France), combines these measurements to retrospectively calculate the weighted average that forms the most stable time scale possible.
ðɪ ˌɪntɚnˈæʃənəl bjˈʊɹɹoʊ ʌv wˈeɪts ænd mˈɛʒɚz bˈɪpəm, fɹˈæns, kəmbˈaɪnz ðiːz mˈɛʒɚmənts tə ɹˌɛtɹoʊspˈɛktɪvli kˈælkjʊlˌeɪt ðə wˈeɪɾᵻd ˈævɹɪdʒ ðæt fˈɔːɹmz ðə mˈoʊst stˈeɪbəl tˈaɪm skˈeɪl pˈɑːsᵻbəl.