| 释义 |
Definition of nutation in English: nutationnoun njuːˈteɪʃ(ə)nn(j)uˈteɪʃən mass noun1A periodic variation in the inclination of the axis of a rotating object. （旋转物体轴心的）倾斜度周期性变化 - 1.1Astronomy A periodic oscillation of the earth's axis which causes the precession of the poles to follow a wavy rather than a circular path.
〔天文〕章动 Example sentencesExamples - In addition to the precession and nutation of the Earth's rotational axis, the Earth itself undergoes a wobble such that the crust wanders about the rotational axis with a combination of two periods and amplitudes.
- There is a small periodic effect called nutation superimposed on precession caused by the motion of the perihelion of the Moon.
- Bessel's work in determining the constants of precession, nutation and aberration won him further honours, such as a prize from the Berlin Academy in 1815.
- The principal causes of the slight irregular motion known as nutation are the Sun and Moon as they continually change location relative to one another.
2Botany
The circular swaying movement of the tip of a growing shoot. 〔植〕外卷，回转，转头（运动）
OriginEarly 17th century (denoting nodding of the head): from Latin nutatio(n-), from nutare 'to nod'. Rhymesablation, aeration, agnation, Alsatian, Amerasian, Asian, aviation, cetacean, citation, conation, creation, Croatian, counterdemonstration, counterproliferation, crustacean, curation, Dalmatian, delation, dilation, donation, duration, elation, fixation, Galatian, geolocation, glocalization, gyration, Haitian, halation, Horatian, ideation, illation, lavation, legation, libation, location, lunation, mutation, natation, nation, negation, notation, oblation, oration, ovation, potation, relation, rogation, rotation, Sarmatian, sedation, Serbo-Croatian, station, staycation, taxation, Thracian, vacation, vexation, vocation, zonation Definition of nutation in US English: nutationnounn(y)o͞oˈtāSHənn(j)uˈteɪʃən 1A periodic variation in the inclination of the axis of a rotating object. （旋转物体轴心的）倾斜度周期性变化 - 1.1Astronomy A periodic oscillation of the earth's axis that causes the precession of the poles to follow a wavy rather than a circular path.
〔天文〕章动 Example sentencesExamples - There is a small periodic effect called nutation superimposed on precession caused by the motion of the perihelion of the Moon.
- The principal causes of the slight irregular motion known as nutation are the Sun and Moon as they continually change location relative to one another.
- Bessel's work in determining the constants of precession, nutation and aberration won him further honours, such as a prize from the Berlin Academy in 1815.
- In addition to the precession and nutation of the Earth's rotational axis, the Earth itself undergoes a wobble such that the crust wanders about the rotational axis with a combination of two periods and amplitudes.
- 1.2Botany The circular swaying movement of the tip of a growing shoot.
〔植〕外卷，回转，转头（运动）
OriginEarly 17th century (denoting nodding of the head): from Latin nutatio(n-), from nutare ‘to nod’. |