In March 1969, Apollo 9 put the lunar module through its paces in Earth orbit, and in May Apollo 10 conducted a "dress rehearsal" in lunar orbit.
ɪn mˈɑːɹtʃ nˈaɪntiːnhˈʌndɹɪd sˈɪksti nˈaɪn, ɐpˈɑːloʊ nˈaɪn pˌʊt ðə lˈuːnɚ mˈɑːdʒuːl θɹuː ɪts pˈeɪsᵻz ɪn ˈɜːθ ˈɔːɹbɪt, ænd ɪn mˈeɪ ɐpˈɑːloʊ tˈɛn kəndˈʌktᵻd ˈeɪ "dɹˈɛs ɹᵻhˈɜːsəl" ɪn lˈuːnɚɹ ˈɔːɹbɪt.