əbzˈɜːvɚz hæv spˈɛkjʊlˌeɪɾᵻd ɪt mˈeɪ biː ɪlˈuːsɚɹi, ɹɪzˈʌltɪŋ fɹʌmðə fˌɪzɪəlˈɑːdʒɪkəl ɪfˈɛkt ʌv əbzˈɜːvɪŋ ɐ bɹˈaɪt, kɹˈɛsəntʃˈeɪpt ˈɑːbdʒɛkt.
Observers have speculated it may be illusory, resulting from the physiological effect of observing a bright, crescent-shaped object.