Semidiameter

[,semidai'æmitә]

解釋/意思:

(noun.) the apparent radius of a celestial body when viewed as a disc from the earth.

亨廷顿編輯--From WordNet

解釋/意思:

(n.) Half of a diameter; a right line, or the length of a right line, drawn from the center of a circle, a sphere, or other curved figure, to its circumference or periphery; a radius.

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