Two factors made the Moon almost impossible to see from inside the spacecraft: three of the five windows fogging up due to out-gassed oils from the silicone sealant, and the attitude required for passive thermal control.
tˈuː fˈæktɚz mˌeɪd ðə mˈuːn ˈɔːlmoʊst ɪmpˈɑːsᵻbəl tə sˈiː fɹʌm ɪnsˈaɪd ðə spˈeɪskɹæft: θɹˈiː ʌvðə fˈaɪv wˈɪndoʊz fˈɑːɡɪŋ ˌʌp dˈuː tʊ ˈaʊtɡˈæst ˈɔɪlz fɹʌmðə sˈɪlɪkˌoʊn sˈiːlənt, ænd ðɪ ˈæɾɪtˌuːd ɹᵻkwˈaɪɚd fɔːɹ pˈæsɪv θˈɜːməl kəntɹˈoʊl.