本文介绍了由地球人造卫星进行天体测量的两项计划，并提出了它们对天体测量学、天体物理学和恒星天文学的影响。
Two projects for astrometry from Earth satellites are described and their impact on astrometry, astrophysics and stellar astronomy are outlined.
本文介绍了由地球人造卫星进行天体测量的两项计划，并提出了它们对天体测量学、天体物理学和恒星天文学的影响。
Two projects for astrometry from Earth satellites are described and their impact on astrometry, astrophysics and stellar astronomy are outlined.
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