“terrestrial time”的概念、定义、翻译、参考文献-科学参考

单词	terrestrial time
释义	terrestrial time Encyclopedia 工学时标释 terrestrial time地球时由国际天文联合会（IAU）定义的现代天文时间标准。是以秒为基本单位的理论理想时标，英文缩写TT。主要服务于在地表上进行的天文观测。理学坐标时释 terrestrial time地球时地心坐标系的一种坐标时。简称TT。
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