计量学
天文
旋转(数学)
地球自转
物理
遥感
系统工程
航空航天工程
计算机科学
光学
工程类
地质学
人工智能
出处
期刊:Metrologia
[IOP Publishing]
日期:2011-07-20
卷期号:48 (4): S132-S144
被引量:11
标识
DOI:10.1088/0026-1394/48/4/s03
摘要
Astronomy has provided a means to mark the passage of time throughout history. One of the repeating phenomena that makes this possible is the Earth's rotation. The basic variability in its rotational speed, however, makes astronomical techniques unsuitable for timekeeping with the precision required for modern applications. Physical metrology from the first mechanical clocks to the most sophisticated atomic standards of today has assumed a growing role in timekeeping. Along with this progress in technology, more sophisticated concepts of timescales have appeared to take advantage of those improvements.
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