Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using physical laws.
hɪstˈɔːɹɪkli, ɐstɹˈɑːnəmi wʌz mˈoːɹ kənsˈɜːnd wɪððə klˌæsɪfɪkˈeɪʃən ænd dᵻskɹˈɪpʃən ʌv fɪnˈɑːmɪnə ɪnðə skˈaɪ, wˌaɪl ˌæstɹəfˈɪzɪks ɐtˈɛmptᵻd tʊ ɛksplˈeɪn ðiːz fɪnˈɑːmɪnə ænd ðə dˈɪfɹənsᵻz bᵻtwˌiːn ðˌɛm jˈuːzɪŋ fˈɪzɪkəl lˈɔːz.