local mean time

简明释义

地方平时又称地方时

英英释义

例句

1.When planning an event, make sure to convert the time to local mean time for all participants.

在计划活动时，请确保将时间转换为所有参与者的地方平均时间。

2.The sundial shows the time in local mean time, which can differ from standard time.

日晷显示的是地方平均时间，这可能与标准时间不同。

3.The ship's log recorded the position at local mean time for navigation purposes.

船只的日志记录了在地方平均时间的定位信息，以便导航。

4.The train schedule is based on local mean time, which means you need to adjust for your timezone.

这个火车时刻表是基于地方平均时间，这意味着你需要根据你的时区进行调整。

5.In astronomy, we often calculate events using local mean time to ensure accuracy.

在天文学中，我们经常使用地方平均时间来计算事件以确保准确性。

作文

Understanding the concept of local mean time is essential for grasping how timekeeping has evolved over the centuries. Before the advent of standardized time zones, people relied on the position of the sun to determine the time of day in their local area. This method of timekeeping was known as local mean time, which refers to the average solar time at a specific location. The term 'mean' indicates that it is an average, as the actual solar time can vary due to the elliptical shape of Earth's orbit and its axial tilt. In simpler terms, local mean time is the time based on the sun's position in the sky. For instance, when the sun is at its highest point in the sky (solar noon), it is considered to be 12:00 PM in local mean time. However, this can differ from the standard time used in various regions. As cities began to grow and transportation improved, discrepancies in timekeeping became more apparent. Trains running on different schedules across regions could create confusion if each locale operated on its own local mean time. To address these issues, the concept of time zones was introduced in the late 19th century, leading to the establishment of standard time across different regions. Nevertheless, understanding local mean time remains valuable, especially in historical contexts or when examining the development of timekeeping technologies. The transition from local mean time to standard time reflects broader societal changes. It illustrates how technological advancements and the need for synchronization in transportation and communication have shaped our understanding of time. For example, the invention of the telegraph and the expansion of the railroad network necessitated a more uniform approach to timekeeping. People began to realize that having a consistent reference for time was crucial for coordination and efficiency. Today, while we primarily use Coordinated Universal Time (UTC) and time zones, the legacy of local mean time persists. Many people still refer to local solar time when discussing activities like gardening or astronomy, where the position of the sun is critical. Additionally, some communities celebrate events based on solar time, honoring the traditional methods of timekeeping that have been passed down through generations. In conclusion, the concept of local mean time is not merely a historical footnote; it serves as a reminder of our relationship with time and the natural world. As we navigate through modern life, it’s important to appreciate the origins of our timekeeping practices. Understanding local mean time enriches our knowledge of history and demonstrates how human innovation continues to adapt to the changing needs of society. Whether we are aware of it or not, the principles behind local mean time continue to influence our daily routines, reminding us of the intricate connection between time, nature, and human activity.

理解地方平均时间的概念对于掌握时间记录如何在几个世纪中演变至关重要。在标准化时区出现之前，人们依靠太阳的位置来确定自己所在地区的时间。这种时间记录方法被称为地方平均时间，指的是特定地点的平均太阳时间。“平均”一词表明这是一种平均值，因为实际的太阳时间可能因地球轨道的椭圆形状和轴倾斜而有所不同。 简单来说，地方平均时间是基于太阳在天空中的位置来计算的时间。例如，当太阳在天空中达到最高点（太阳正午）时，在地方平均时间中被视为12:00 PM。然而，这可能与各个地区使用的标准时间不同。随着城市的发展和交通的改善，时间记录中的差异变得更加明显。跨地区运行的火车如果各自以自己的地方平均时间运行，可能会造成混乱。 为了解决这些问题，19世纪晚期引入了时区的概念，从而在不同地区建立了标准时间。然而，理解地方平均时间仍然具有价值，特别是在历史背景下或在研究时间记录技术的发展时。 从地方平均时间到标准时间的过渡反映了更广泛的社会变化。这说明了技术进步和交通、通信同步需求如何塑造了我们对时间的理解。例如，电报的发明和铁路网络的扩展需要一种更统一的时间记录方式。人们开始意识到，拥有一致的时间参考对于协调和效率至关重要。 今天，尽管我们主要使用协调世界时间（UTC）和时区，但地方平均时间的遗产依然存在。许多人在讨论如园艺或天文学等活动时仍会提到当地的太阳时间，这些活动中太阳的位置至关重要。此外，一些社区根据太阳时间庆祝活动，尊重那些代代相传的传统时间记录方法。 总之，地方平均时间的概念不仅仅是一个历史脚注；它提醒我们与时间和自然世界的关系。当我们在现代生活中穿行时，欣赏我们时间记录实践的起源是很重要的。理解地方平均时间丰富了我们对历史的认识，并展示了人类创新如何继续适应社会不断变化的需求。无论我们是否意识到，地方平均时间背后的原则仍然影响着我们的日常生活，提醒我们时间、自然和人类活动之间的复杂联系。