Greenwich mean astronomical

简明释义

格林尼治天文时

英英释义

例句

1.We set our watches to Greenwich mean astronomical time before starting the experiment.

在开始实验之前，我们将手表调到格林威治平均天文时间。

2.The airline schedules flights based on Greenwich mean astronomical time to avoid confusion.

航空公司根据格林威治平均天文时间安排航班，以避免混淆。

3.The world clock displays Greenwich mean astronomical time as a reference for all time zones.

世界时钟显示格林威治平均天文时间作为所有时区的参考。

4.In astronomy, the Greenwich mean astronomical time is essential for observing celestial events.

在天文学中，格林威治平均天文时间对于观察天文事件至关重要。

5.The ship's captain used the Greenwich mean astronomical time to navigate through the waters accurately.

船长使用格林威治平均天文时间来准确导航。

作文

The concept of time has always been a fundamental aspect of human civilization. From the early sundials to the modern atomic clocks, our understanding of time has evolved significantly. One of the most critical developments in this evolution is the establishment of the standard time system based on the prime meridian, which runs through Greenwich, London. This leads us to the term Greenwich mean astronomical, which refers to the mean solar time at the Royal Observatory in Greenwich. It serves as the basis for Coordinated Universal Time (UTC) and has a significant impact on how we perceive and measure time today.Historically, the need for a standardized time arose from the expansion of railroads and telecommunication in the 19th century. Before this standardization, local mean times were used, which varied from one location to another. This inconsistency created confusion, especially for travelers and businesses. The introduction of Greenwich mean astronomical time provided a uniform reference point that could be used globally. This was particularly important for navigation at sea, where accurate timekeeping was essential for determining longitude.The Greenwich mean astronomical time is calculated based on the position of the Sun in relation to the Earth. Specifically, it represents the average time it takes for the Earth to complete one full rotation relative to the Sun. This average is necessary because the Earth's orbit is elliptical, causing variations in the solar day length. By establishing a mean time, astronomers and navigators could rely on a more consistent method for calculating time, regardless of geographic location.In practical terms, the adoption of Greenwich mean astronomical time has transformed various aspects of daily life. For instance, international travel relies heavily on standardized time zones, which are based on this mean time. Airlines schedule flights, and train systems coordinate arrivals and departures according to these time zones, ensuring that passengers can plan their journeys with confidence.Furthermore, the significance of Greenwich mean astronomical time extends beyond transportation. In fields such as telecommunications and internet technology, precise timing is crucial for data transmission and synchronization. The reliance on UTC, which is derived from Greenwich mean astronomical time, ensures that systems across the globe operate seamlessly together.As we look to the future, the importance of Greenwich mean astronomical time remains evident. With advancements in technology and the growing interconnectedness of our world, having a reliable time standard is more critical than ever. Scientists continue to refine our understanding of time, and while atomic clocks have taken precedence over traditional methods, the historical significance of Greenwich mean astronomical time cannot be overlooked. It laid the groundwork for our current timekeeping systems and continues to influence how we live and work.In conclusion, the term Greenwich mean astronomical encapsulates a pivotal moment in the history of timekeeping. It represents not just a technical standard but also a vital tool that has shaped our society in numerous ways. Understanding its origins and implications allows us to appreciate the complex nature of time and its integral role in our lives. As we move forward, we must acknowledge the contributions of Greenwich mean astronomical time to our global community and recognize its lasting legacy in the way we measure and understand time.

时间的概念一直是人类文明的基本方面。从早期的日晷到现代的原子钟，我们对时间的理解已经发生了显著变化。在这一演变过程中，一个重要的发展是基于通过伦敦格林威治的本初子午线建立的标准时间系统。这使我们引入了术语格林威治平均天文时间，它指的是位于格林威治皇家天文台的平均太阳时间。它作为协调世界时（UTC）的基础，对我们今天如何感知和测量时间产生了重大影响。历史上，随着19世纪铁路和电信的扩展，对标准化时间的需求应运而生。在此标准化之前，当地的平均时间被使用，这在不同地点之间存在差异。这种不一致性造成了困惑，尤其是对于旅行者和商家而言。格林威治平均天文时间的引入提供了一个可以在全球范围内使用的统一参考点。这在海上的导航中尤为重要，因为准确的时间记录对于确定经度至关重要。格林威治平均天文时间是基于太阳与地球之间的位置计算的。具体而言，它代表地球相对于太阳完成一次完整旋转所需的平均时间。这个平均值是必要的，因为地球的轨道是椭圆形的，导致太阳日长度的变化。通过建立一个平均时间，天文学家和导航员可以依赖一种更一致的方法来计算时间，无论地理位置如何。在实际应用中，采用格林威治平均天文时间改变了日常生活的各个方面。例如，国际旅行在很大程度上依赖于基于这一平均时间的标准化时区。航空公司安排航班，火车系统根据这些时区协调到达和出发，确保乘客可以自信地规划他们的旅程。此外，格林威治平均天文时间的重要性超越了交通运输。在电信和互联网技术等领域，精确的计时对于数据传输和同步至关重要。对UTC的依赖，正是源于格林威治平均天文时间，确保全球各系统能够无缝协作。展望未来，格林威治平均天文时间的重要性依然显而易见。随着技术的进步和我们世界的日益互联，拥有可靠的时间标准比以往任何时候都更加重要。科学家们继续完善我们对时间的理解，尽管原子钟已优于传统方法，但格林威治平均天文时间的历史意义不可忽视。它为我们当前的计时系统奠定了基础，并继续影响着我们的生活和工作方式。总之，术语格林威治平均天文时间概括了时间记录历史上的一个关键时刻。它不仅代表了一项技术标准，也是塑造我们社会的一个重要工具。理解其起源和影响使我们能够欣赏时间的复杂性及其在我们生活中的重要角色。随着我们向前发展，我们必须承认格林威治平均天文时间对全球社区的贡献，并认识到它在我们测量和理解时间的方式中的持久遗产。