semidiameter

[semɪdaɪ'æmɪtə] [ˌsemaɪdaɪ'æmɪtə]
英英词典释义
  • Noun
    1. the apparent radius of a celestial body when viewed as a disc from the earth
行业词典
  • 航海科技: 半径差;又称 :半径差(SD );