mean solar time

简明释义

平时平太阳时

英英释义

例句

1.The clock is set to mean solar time, which is based on the Earth's rotation.

时钟设置为平均太阳时间，这是基于地球的自转。

2.In navigation, mean solar time is crucial for determining longitude.

在导航中，平均太阳时间对于确定经度至关重要。

3.Astronomers often rely on mean solar time for their observations.

天文学家通常依赖于平均太阳时间进行观察。

4.The difference between local time and mean solar time can affect scheduling.

当地时间与平均太阳时间之间的差异可能会影响日程安排。

5.We need to convert our clocks to mean solar time for the experiment.

我们需要将时钟转换为实验所需的平均太阳时间。

作文

The concept of mean solar time is fundamental to our understanding of timekeeping and the way we organize our daily lives. To grasp this idea, it is essential to delve into the relationship between the Earth’s rotation and the measurement of time. The Earth rotates on its axis once approximately every 24 hours, which gives us the cycle of day and night. However, the actual length of a solar day can vary slightly due to the elliptical shape of the Earth's orbit around the sun and its axial tilt. This variability leads to the concept of mean solar time, which serves as an average measure of time that accounts for these fluctuations.Historically, people relied on sundials to tell time based on the position of the sun in the sky. However, this method was not precise because the sun's apparent motion varies throughout the year. To address this inconsistency, the concept of mean solar time was developed. It represents the average time it takes for the Earth to rotate relative to the sun, providing a standard reference point for timekeeping.In practice, mean solar time is used to define time zones and establish local time. For example, Greenwich Mean Time (GMT) is based on the mean solar time at the Prime Meridian, which runs through Greenwich, England. This standard allows different regions around the world to synchronize their clocks and maintain a consistent schedule despite variations in solar time due to geographical differences.Understanding mean solar time also has implications for various fields, including astronomy, navigation, and even agriculture. Farmers, for instance, rely on accurate timekeeping to determine the best times for planting and harvesting crops, which are often influenced by the position of the sun. Additionally, navigators use mean solar time to calculate their positions at sea, ensuring safe and efficient travel.Moreover, the introduction of atomic clocks and the concept of Coordinated Universal Time (UTC) has further refined our understanding of time. While mean solar time provides a historical context for timekeeping, modern technology allows us to measure time with incredible precision. However, it is important to remember that UTC still incorporates mean solar time as a foundational element, ensuring that our timekeeping remains connected to the natural rhythms of the Earth.In conclusion, mean solar time is a crucial concept that underpins our systems of timekeeping. It bridges the gap between the natural world and human organization, allowing us to create schedules, coordinate activities, and navigate our lives with a sense of order. As we continue to advance technologically, it is vital to appreciate the historical significance of mean solar time and its ongoing relevance in our increasingly complex world.

“平均太阳时间”这一概念对我们理解时间测量及组织日常生活至关重要。要掌握这个概念，必须深入探讨地球自转与时间测量之间的关系。地球大约每24小时自转一次，这构成了昼夜循环。然而，由于地球围绕太阳的椭圆轨道和轴倾斜，实际的太阳日长度会有所变化。这种变化导致了“平均太阳时间”的概念，它作为一种时间的平均测量，考虑了这些波动。历史上，人们依靠日晷根据太阳在天空中的位置来报时。然而，这种方法并不精确，因为太阳的表观运动在一年中是变化的。为了解决这一不一致性，发展了“平均太阳时间”的概念。它代表了地球相对于太阳自转的平均时间，为时间测量提供了标准参考点。在实践中，“平均太阳时间”被用来定义时区和建立当地时间。例如，格林威治标准时间（GMT）基于通过英国格林威治的本初子午线的平均太阳时间。这个标准允许世界各地的不同地区同步他们的时钟，并保持一致的时间安排，尽管由于地理差异，太阳时间有所不同。理解“平均太阳时间”对多个领域也有重要意义，包括天文学、导航，甚至农业。例如，农民依赖准确的时间测量来确定最佳的播种和收割时间，这通常受太阳位置的影响。此外，导航员利用“平均太阳时间”来计算他们在海上的位置，确保安全高效的旅行。此外，原子钟的引入和协调世界时（UTC）概念进一步完善了我们对时间的理解。虽然“平均太阳时间”为时间测量提供了历史背景，但现代技术使我们能够以惊人的精度测量时间。然而，重要的是要记住，UTC仍然将“平均太阳时间”作为基础元素，确保我们的时间测量与地球的自然节奏相连接。总之，“平均太阳时间”是支撑我们时间测量系统的重要概念。它弥合了自然世界与人类组织之间的鸿沟，使我们能够创建日程、协调活动，并有序地导航我们的生活。随着我们在技术上不断进步，理解“平均太阳时间”的历史重要性及其在日益复杂的世界中的持续相关性至关重要。