单词	semidiameter
释义	semidiameter /ˌsɛmɪdʌɪˈamɪtə / noun Geometry Half of a diameter.The moon will, at the full, be totally eclipsed, if its latitude is less than the difference between its own semidiameter, and that of the earth's shadow.... By the semidiameter of a celestial object, is meant the angle which the radius of its apparent circular disc subtends at the eye of the observer.
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