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首页> 外文期刊>Metrologia: International Journal of Scientific Metrology: = Internationale Zeitschrift fur Wissenschaftliche Metrologie: = Journal International de Metrologie Scientifique >The leap second: its history and possible future
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The leap second: its history and possible future

机译：second秒：它的历史和可能的未来

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摘要

This paper reviews the theoretical motivation for the leap second in the context of the historical evolution of time measurement. The periodic insertion of a leap second step into the scale of Coordinated Universal Time (UTC) necessitates frequent changes in complex timekeeping systems and is currently the subject of discussion in working groups of various international scientific organizations. UTC is an atomic time scale that agrees in rate with International Atomic Time (TAl), but differs by an integral number of seconds, and is the basis of civil time. In contrast, Universal Time (UT1) is an astronomical time scale defined by the Earth's rotation and is used in celestial navigation. UTC is presently maintained to within 0.9 s of UT1. As the needs of celestial navigation that depend on UT1 can now be met by satellite systems, such as the Global Positioning System (GPS), options for revising the definition of UTC and the possible role of leap seconds in the future are considered.
机译：本文在时间测量的历史演变中回顾了second秒的理论动机。在协调世界时（UTC）量表中定期插入a跃步骤需要对复杂的计时系统进行频繁更改，并且目前是各个国际科学组织工作组中讨论的主题。 UTC是一种原子时标，与国际原子时（TAI）的速率一致，但相差整数秒，是民用时间的基础。相比之下，世界时（UT1）是由地球自转定义的天文时标，用于天体导航。目前，UTC保持在UT1的0.9 s之内。由于现在可以通过卫星系统（例如全球定位系统（GPS））满足依赖UT1的天体导航的需求，因此考虑了用于修改UTC定义的选项以及将来of秒的可能作用。

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