the directional-hemispherical reflectance at that solar zenith angle, , sometimes referred to as black-sky albedo, and
ðə dᵻɹˈɛkʃənəlhˌɛmɪsfˈɛɹɪkəl ɹᵻflˈɛktəns æt ðæt sˈoʊlɚ zˈiːnɪθ ˈæŋɡəl, , sˈʌmtaɪmz ɹᵻfˈɜːd tʊ æz blˈækskˈaɪ ælbˈiːdoʊ, ænd