proper motion
英 [ˈprɔpə ˈməuʃən] 美 [ˈprɑpɚ ˈmoʃən]

n.

自行，天体的固有运动；

英英释义

Proper motion

• The proper motion of a star is its angular change in position over time as seen from the center of mass of the Solar System. It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree.

以上来源于:Wikipedia

双语例句

用作名词(n.)

1. Risk the illegal website proper motion that establishs with stockjobber name to shut.
   冒用证券公司名义设立的非法网站自行关闭。
2. However, if its membership can be confirmed by proper motion and radial velocity determinations, the cause of light variation may not be pulsation.
   但是，如果自行或视线速度测定证实为其成员星，那么变光的原因也许不是脉动。

权威例句

The Tycho-2 catalogue : positions, proper motions and two-colour photometry of the 2.5 million brightest stars
The Optical Gravitational Lensing Experiment. Catalog of high proper motion stars towards the Magellanic Clouds
Proper motions and distances of H2O maser sources. I - The outflow in Orion-KL
The Proper Motion of Sagittarius A*. II. The Mass of Sagittarius A*
A Survey of Proper-Motion Stars. XV. Orbital Solutions for 34 Double-lined Spectroscopic Binaries
A Survey of Proper-Motion Stars. XVI. Orbital Solutions for 171 Single-lined Spectroscopic Binaries
A survey of proper motion stars. 12: an expanded sample
High Proper Motion Stars in the Vicinity of SGR A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. V. Final Measurement for Fornax
The APM Proper Motion Project – II. The lower proper motion stars