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词汇 semi-major-axis
释义 BETA

semi-major axis

collocation in English

meanings of semi, majorand axis


These words are often used together. Click on the links below to explore the meanings.
semi
noun[ C ]
uk /ˈsem.i/ us /ˈsem.aɪ/
one of the two games that are played to decide who will take part in the final game of ...
See more at semi
major
noun[ C ]
uk /ˈmeɪ.dʒər/ us /ˈmeɪ.dʒɚ/
an officer of middle rank in the British, US, and many other ...
See more at major
axis
noun[ C ]
uk /ˈæk.sɪs/ us /ˈæk.sɪs/
a real or imaginary straight line going through the centre of an object that is spinning, or a line that divides a symmetrical shape into two ...
See more at axis


Examples of semi-major axis


semi-major axis
From the perspective of the perturbation theory used in celestial mechanics to compute the evolution of the orbit, the semi-majoraxis is an adiabatic invariant.
From
Wikipedia

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For the special case of a circle, the semi-majoraxis is the radius.
From
Wikipedia

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The expressions below give the auxiliary latitudes in terms of the geodetic latitude, the semi-majoraxis, "a", and the eccentricity, "e".
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This means that it is slightly flattened, its semi-minor axis being 70% of its semi-majoraxis.
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This was possible due to large size of the planet and its small semi-majoraxis.
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This form of the equation is particularly useful when dealing with parabolic trajectories, for which the semi-majoraxis is infinite.
From
Wikipedia

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The semi-majoraxis is known if the mean motion and the gravitational mass are known.
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Wikipedia

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The two stars orbit each other with a semi-majoraxis of 1.437 arcseconds and a period of 116.24 years.
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For any ellipse, let "a" be the length of its semi-majoraxis and "b" be the length of its semi-minor axis.
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Wikipedia

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As the eccentricity of the orbit evolves, the semi-majoraxis of the orbital ellipse remains unchanged.
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The semi-majoraxis is one half of the major axis, and thus runs from the centre, through a focus, and to the perimeter.
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To calculate a dynamical parallax, the angular semi-majoraxis of the orbit of the stars around each other is observed, together with their apparent brightness.
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One is invariably the equatorial radius, which is the semi-majoraxis, "a".
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This central pair has a semi-majoraxis of around 867 km and a period of about 1.9 days.
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The two stars orbit around their common centre of mass once every 78.7 years and the secondary has a semi-majoraxis of 0.165 arcseconds.
From
Wikipedia

This example is from Wikipedia and may be reused under a CC BY-SA license.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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