名词短语
中文翻译：天体运动的精确位置
同义词：
['proper motion', 'precise position']
例句：
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1.The star's proper motion is measured by its shift in the sky over time.
该恒星的精确位置通过其在天空中随时间移动来测量。
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2. Astronomers use proper motion to study the movements of galaxies and clusters of galaxies.
天文学家使用精确位置来研究星系和星系团的运动。
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3. The star's proper motion has been observed to change over time due to gravitational interactions with nearby stars.
由于与附近恒星的引力相互作用，该恒星的精确位置观察到随时间变化。