ɐsˈuːmɪŋ ðætðɪ ˈɜːθ wʌzɐ kəmplˈiːtli ɹˈɪdʒɪd bˈɑːdi, ðeɪ kˈælkjʊlˌeɪɾᵻd ðə pˈiəɹɪəd ʌv ˈɜːθz pˈɑːlhoʊd wˈɑːbəl təbi ɐbˌaʊt nˈaɪn tˈɛn mˈʌnθs.
Assuming that the Earth was a completely rigid body, they calculated the period of Earth’s polhode wobble to be about 9–10 months.