CELESTIAL LONGITUDE
\səlˈɛstjə͡l lˈɒnd͡ʒɪtjˌuːd], \səlˈɛstjəl lˈɒndʒɪtjˌuːd], \s_ə_l_ˈɛ_s_t_j_əl l_ˈɒ_n_dʒ_ɪ_t_j_ˌuː_d]\
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(astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body; expressed in hours and minutes and second; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
By Princeton University
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