搜索结果: 1-1 共查到“天文学其他学科 Proper motions”相关记录1条 . 查询时间(0.031 秒)
More than a decade elapsed after the HIPPARCOS ESA missi-
on (ESA 1997) observations have been collected. This rst astronomical satellite
mission was less than 4 years long so that 1991.25 is the e...
