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
Word of the day
Platidiam
- An inorganic water-soluble platinum complex. After undergoing hydrolysis, it reacts DNA produce both intra interstrand crosslinks. These crosslinks appear to impair replication and transcription of DNA. The cytotoxicity cisplatin correlates with cellular arrest in G2 phase cell cycle.