ðə nˈɑːvəl pɹəvˈaɪdz ɐn ɛksplɐnˈeɪʃən æz tə wˌaɪ dʒˈuːpɪɾɚ hæd ˈoʊnli twˈɛlv mˈuːnz æt ðə tˈaɪm ʌvðə fˈoːɹθ dˈɑːktɚ sˈɪɹiəl ɹᵻvˈɛndʒ ʌvðə sˈaɪbɚmˌɛn wˈɛn, æt lˈæst kˈaʊnt, ðə plˈænɪt hɐz sˈɪkstiθɹˈiː mˈuːnz.
The novel provides an explanation as to why Jupiter had only twelve moons at the time of the Fourth Doctor serial Revenge of the Cybermen when, at last count, the planet has sixty-three moons.