proper motion

proper motion读音音标

英 [ˈprɔpə ˈməuʃən]

美 [ˈprɑpɚ ˈmoʃən]

proper motion意思解释

n.

自行，天体的固有运动；

英英释义

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.

双语例句

用作名词(n.)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。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。