mean solar unit

简明释义

平太阳日

英英释义

例句

1.Astronomers use the mean solar unit (平均太阳单位) to calculate the orbits of planets.

天文学家使用mean solar unit (平均太阳单位)来计算行星的轨道。

2.Many calendars are based on the mean solar unit (平均太阳单位) to align with the seasons.

许多日历是基于mean solar unit (平均太阳单位)来与季节对齐的。

3.The concept of the mean solar unit (平均太阳单位) helps in understanding timekeeping.

理解时间的概念时，mean solar unit (平均太阳单位)非常重要。

4.In navigation, the mean solar unit (平均太阳单位) is crucial for accurate positioning.

在导航中，mean solar unit (平均太阳单位)对于准确定位至关重要。

5.The length of a day is defined as one mean solar unit (平均太阳单位).

一天的长度被定义为一个mean solar unit (平均太阳单位)。

作文

The concept of time has always been fundamental to human civilization, and one of the most significant units of measuring time is the solar day. The average length of a solar day is defined as a mean solar unit, which represents the time it takes for the Earth to complete one full rotation on its axis relative to the position of the Sun. This measurement is crucial for our daily lives, as it governs our schedules, activities, and even our biological rhythms. Understanding the mean solar unit is essential for both scientific and practical purposes.Historically, civilizations have relied on the natural cycles of the sun to organize their days. Ancient cultures observed the movement of the sun across the sky, marking time with sundials and other primitive devices. However, as societies advanced, the need for a more precise and standardized measure of time became apparent. This led to the establishment of the mean solar unit as a benchmark for timekeeping.The mean solar unit is not merely an arbitrary figure; it is derived from extensive astronomical observations. It averages out the variations in the Earth's rotational speed and its elliptical orbit around the Sun. This averaging process results in a value that is approximately 24 hours, but it is important to note that the actual solar day can vary slightly due to factors such as the Earth's axial tilt and its orbital eccentricity. Thus, the mean solar unit serves as a reliable reference point for timekeeping.In modern times, the mean solar unit has profound implications beyond just keeping track of the hours in a day. It plays a critical role in various fields, including astronomy, navigation, and even technology. For instance, satellites rely on precise timing to maintain their orbits and communicate effectively with ground stations. In the realm of global positioning systems (GPS), the accurate understanding of the mean solar unit is vital for determining locations with pinpoint precision.Moreover, the mean solar unit is integral to our understanding of time zones. As the Earth rotates, different parts of the world experience daylight and darkness at different times. To accommodate this, the world is divided into time zones based on the mean solar unit. Each time zone typically represents a difference of one hour from Coordinated Universal Time (UTC), which is itself based on the mean solar unit. This system allows for a synchronized approach to timekeeping across the globe, facilitating international communication and travel.In conclusion, the mean solar unit is a foundational element of our understanding of time. It encapsulates the relationship between the Earth and the Sun, providing a consistent framework for measuring the passage of time. As we continue to advance technologically and scientifically, the significance of the mean solar unit will only grow, reminding us of the intricate connections between celestial phenomena and our everyday lives. By appreciating this fundamental unit of time, we gain a deeper insight into both the universe and our place within it.

时间的概念一直是人类文明的基础，其中一个最重要的时间测量单位就是太阳日。太阳日的平均长度被定义为平均太阳单位，它代表地球相对于太阳完成一次完整自转所需的时间。这个测量对我们的日常生活至关重要，因为它决定了我们的日程、活动，甚至我们的生物节奏。理解平均太阳单位对科学和实际目的都是必不可少的。历史上，各种文明一直依赖于太阳的自然周期来组织他们的日子。古代文化观察到太阳在天空中的运动，用日晷和其他原始设备来标记时间。然而，随着社会的发展，对更精确和标准化的时间测量的需求变得明显。这导致了平均太阳单位作为时间计量基准的建立。平均太阳单位并非一个任意的数字；它源于广泛的天文观测。它平均了地球自转速度的变化以及其围绕太阳的椭圆轨道。这一平均过程产生了一个大约为24小时的值，但需要注意的是，实际的太阳日可能会因地球的轴倾角和轨道偏心率等因素而略有变化。因此，平均太阳单位作为时间计量的可靠参考点。在现代，平均太阳单位的影响超越了仅仅跟踪一天中的小时。它在多个领域中发挥着关键作用，包括天文学、导航，甚至科技。例如，卫星依赖精确的时间来维持其轨道并与地面站有效通信。在全球定位系统（GPS）领域，准确理解平均太阳单位对精确确定位置至关重要。此外，平均太阳单位是我们理解时区的核心。随着地球的自转，世界不同部分在不同时间经历白昼和黑夜。为了适应这一点，世界根据平均太阳单位划分为时区。每个时区通常代表与协调世界时（UTC）之间的一个小时差，这本身也是基于平均太阳单位。这一系统使全球的时间计量能够同步，有助于国际交流和旅行。总之，平均太阳单位是我们理解时间的基础元素。它概括了地球与太阳之间的关系，为测量时间的流逝提供了一致的框架。随着我们在技术和科学上的不断进步，平均太阳单位的重要性只会增加，让我们意识到天体现象与日常生活之间的复杂联系。通过欣赏这一基本的时间单位，我们能更深入地理解宇宙及我们在其中的位置。