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词汇 semimajor axis
释义

Definition of semimajor axis in English:

semimajor axis

noun
Geometry
  • Either of the halves of the major axis of an ellipse.

    〔几何〕(椭圆的)半长轴

    Example sentencesExamples
    • The initial covariance matrices of each lander were set to correspond to a 15 by 8 kilometer landing ellipse with a semimajor axis in the East-West direction.
    • The semimajor axes of an ellipse are the longest lines crossing the area covered by the ellipse, and including the two foci.
    • To the extent that the parent star's mass is known from its spectrum and luminosity, the periodicity of the Doppler signal yields the planetary orbit's semimajor axis a.
    • The speed of the satellite is inversely proportional to the square root of the radius of the orbit (or more strictly the semimajor axis of the orbit).
    • Kepler's third law of planetary motion says that the square of the planet's orbital period is proportional to the cube of its semimajor axis.

Definition of semimajor axis in US English:

semimajor axis

nounˈsemˌī-
Geometry
  • Either of the halves of the major axis of an ellipse.

    〔几何〕(椭圆的)半长轴

    Example sentencesExamples
    • The semimajor axes of an ellipse are the longest lines crossing the area covered by the ellipse, and including the two foci.
    • The speed of the satellite is inversely proportional to the square root of the radius of the orbit (or more strictly the semimajor axis of the orbit).
    • The initial covariance matrices of each lander were set to correspond to a 15 by 8 kilometer landing ellipse with a semimajor axis in the East-West direction.
    • To the extent that the parent star's mass is known from its spectrum and luminosity, the periodicity of the Doppler signal yields the planetary orbit's semimajor axis a.
    • Kepler's third law of planetary motion says that the square of the planet's orbital period is proportional to the cube of its semimajor axis.
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