《Tetrabiblos》The Periodical Divisions Of TimeClaudius Ptolemy（Ashmand 英譯 1822）
Occultation is when a star becomes invisible by being carried under the rays of the luminary; conjunction, when it is placed under the luminary’s centre; and succedent rising, when it begins to reappear on issuing out beyond the rays.
段落 tetra-4-theperiodi-56public-domain (Ashmand 1822)
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