CIRCLE OF PERPETUAL OCCULTATION
\sˈɜːkə͡l ɒv pəpˈɛt͡ʃuːə͡l ˌɒkəltˈe͡ɪʃən], \sˈɜːkəl ɒv pəpˈɛtʃuːəl ˌɒkəltˈeɪʃən], \s_ˈɜː_k_əl ɒ_v p_ə_p_ˈɛ_tʃ_uː_əl ˌɒ_k_ə_l_t_ˈeɪ_ʃ_ə_n]\
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The circle or the great sphere for a given station which separates the part that comes above from the part that never comes above the horizon ; thus, for a station in latitude 51° N. the circle of perpetual occultation is the parallel of declination of 39° S. ; no star whose declination exceeds 39° S. ever coming above the horizon.
By Henry Percy Smith
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