Astronomers % are involved in the observation, analysis and research of various astronomical phenomena, such as the movements of celestial bodies like moons, planets, stars and galaxies.
天文学家的工作涉及到观察、分析以及研究各种各样的天文现象，比如月亮、行星、恒星、银河等天体的运动。
The conditions required to construct, a quasi-inertial celestial reference frame are discussed, and several cases, in which if the ground-based observation can satisfy, arc enumerated.
本文叙述了建立准惯性天球参考架应满足的条件，列举了几种地面观测能否满足这些条件的情况。
Astronomers are involved in the observation, analysis and research of various astronomical phenomena, such as the movements of celestial bodies like moons, planets, stars and galaxies.
天文学家的工作涉及到观察、分析以及研究各种各样的天文现象，比如月亮、行星、恒星、银河等天体的运动。
Astronomers o are involved in the observation, analysis and research of various astronomical phenomena, such as the movements of celestial bodies like moons, planets, stars and galaxies.
天文学家的工作涉及到观察、分析以及研究各种各样的天文现象，比如月亮、行星、恒星、银河等天体的运动。
Astronomers o are involved in the observation, analysis and research of various astronomical phenomena, such as the movements of celestial bodies like moons, planets, stars and galaxies.
天文学家的工作涉及到观察、分析以及研究各种各样的天文现象，比如月亮、行星、恒星、银河等天体的运动。
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