local mean time

简明释义

当地时间

英英释义

例句

1.When planning your trip, make sure to convert your watch to local mean time to avoid confusion.

在计划旅行时，确保将手表转换为地方平均时间以避免混淆。

2.The train schedule is based on local mean time, which means that the departure times are adjusted according to the local solar time.

火车时刻表基于地方平均时间，这意味着出发时间根据当地的太阳时间进行调整。

3.The event will start at 3 PM local mean time, so please arrive early.

活动将在地方平均时间下午3点开始，所以请提前到达。

4.In the 19th century, towns would set their clocks to local mean time to synchronize daily activities.

在19世纪，城镇会将他们的时钟设置为地方平均时间以同步日常活动。

5.Astronomers often use local mean time to calculate the positions of celestial bodies.

天文学家通常使用地方平均时间来计算天体的位置。

作文

The concept of local mean time is crucial in understanding how we measure time based on the position of the sun. Before the advent of standardized time zones, people relied on their local environment to determine the time of day. Local mean time refers to the average time at a particular location, calculated by observing the sun's position in the sky. This means that noon, for example, would be defined as the moment when the sun reaches its highest point in the sky for that specific area. Historically, every town and city had its own local mean time, leading to a diverse array of times across different regions. This situation posed challenges, especially for travel and communication, as trains and ships had to synchronize their schedules without a common time reference. The introduction of railroads in the 19th century highlighted the need for a more standardized approach to timekeeping. In response, Sir Sandford Fleming proposed the division of the world into 24 time zones, each one hour apart, which helped to unify the concept of time. However, even with this new system, the idea of local mean time remained significant. It served as a foundation for understanding how local solar time varies from the standardized time we use today. For instance, if you were in a city located west of the prime meridian, your local mean time would be slightly behind Greenwich Mean Time (GMT), while cities to the east would be ahead. The significance of local mean time can also be seen in the context of astronomy and navigation. Sailors and astronomers have long used the sun’s position to determine their latitude and longitude. Knowing the local mean time allows navigators to calculate their position accurately. In essence, it connects our understanding of time with the natural world, emphasizing the relationship between celestial movements and human activities. In modern times, while we predominantly rely on standardized time zones for daily activities, the principles of local mean time still resonate. For instance, daylight saving time adjustments reflect the need to align human schedules with the natural light provided by the sun. Furthermore, the rise of technology and global communication has brought about discussions on the relevance of local mean time in a world that operates on a 24/7 basis. Many argue that despite the advantages of a synchronized global time, there is beauty and practicality in returning to a more localized understanding of time, where daily rhythms are dictated by natural phenomena rather than arbitrary clocks. In conclusion, local mean time is not merely an archaic concept but a fundamental aspect of how we have historically understood and interacted with time. It emphasizes the importance of our environment in shaping our perception of time and serves as a reminder of the intricate relationship between humanity and the cosmos. As we continue to navigate through a rapidly changing world, perhaps we can learn from the past and appreciate the value of aligning our lives more closely with the natural patterns around us, thus honoring the essence of local mean time.

“地方平均时间”的概念对于理解我们如何根据太阳的位置来衡量时间至关重要。在标准化时区出现之前，人们依赖于当地环境来确定一天中的时间。“地方平均时间”是指在特定位置计算的平均时间，通过观察太阳在天空中的位置来确定。这意味着中午，例如，将被定义为太阳在该特定区域达到最高点的时刻。历史上，每个城镇和城市都有自己的“地方平均时间”，这导致不同地区之间存在多样的时间。这种情况带来了挑战，尤其是在旅行和交流方面，因为火车和船只必须在没有共同时间参考的情况下同步其时间表。19世纪铁路的引入突显了对更标准化时间管理方法的需求。作为回应，桑德福德·弗莱明爵士提出将世界划分为24个时区，每个时区相隔一小时，这有助于统一时间的概念。然而，即使在这个新系统下，“地方平均时间”的理念仍然具有重要意义。它为理解我们今天使用的标准时间如何与当地太阳时间变化提供了基础。例如，如果你在位于本初子午线以西的城市，你的“地方平均时间”会略落后于格林威治标准时间（GMT），而位于东部的城市则会提前。“地方平均时间”的重要性还可以在天文学和导航的背景中看到。水手和天文学家长期以来一直利用太阳的位置来确定他们的纬度和经度。知道“地方平均时间”可以让导航员准确计算他们的位置。本质上，它将我们对时间的理解与自然世界联系起来，强调了天体运动与人类活动之间的关系。在现代，尽管我们主要依赖标准化时区进行日常活动，但“地方平均时间”的原则仍然引起共鸣。例如，夏令时的调整反映了人们需要将人类日程与太阳提供的自然光对齐。此外，科技和全球通信的崛起引发了关于在一个24/7运作的世界中“地方平均时间”相关性的讨论。许多人认为，尽管同步的全球时间有其优势，但回归到更本地化的时间理解中，日常节奏由自然现象决定，而不是任意的时钟，是一种美丽且实用的做法。总之，“地方平均时间”不仅仅是一个过时的概念，而是我们历史上理解和与时间互动的基本方面。它强调了我们的环境在塑造我们对时间的感知中的重要性，并提醒我们人类与宇宙之间复杂的关系。随着我们继续在快速变化的世界中航行，也许我们可以从过去中吸取教训，更加欣赏将我们的生活与周围的自然模式更紧密地对齐的价值，从而尊重“地方平均时间”的本质。