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semidiameter

/ˌsɛm.ɪ.daɪˈæm.ɪ.tər/

翻译: 从地球观测天体时,天体视圆面的半径,通常以角度表示;也泛指半径或半直径。

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noun

C2formalcommonscientific/ˌsɛm.ɪ.daɪˈæm.ɪ.tər/

A noun referring to the apparent radius of a celestial body when viewed as a disc from Earth.

  • 🇨🇳从地球观测天体时,天体视圆面的半径,通常以角度表示;也泛指半径或半直径。
  1. Apparent radius of a celestial body C2 formal scientific

    The apparent radius of a celestial body when viewed as a disc from the earth.

    • The semidiameter of the moon is used to calculate its distance from Earth.
    • Astronomers measured the semidiameter of the planet to determine its size.
    • The semidiameter of the sun varies slightly due to Earth's elliptical orbit.

    🇨🇳天体视半径

  • semidiameters plural form
  • semidiameters' possessive plural form
  • semidiameter's possessive singular form