Greenwich sidereal time

简明释义

格林恒星时格林恒星时格林尼治恒星时

英英释义

例句

1.The star charts are based on Greenwich sidereal time 格林威治恒星时间, helping navigators find their way at night.

星图是基于Greenwich sidereal time 格林威治恒星时间，帮助导航员在夜间找到方向。

2.When planning an observation, make sure to convert your local time to Greenwich sidereal time 格林威治恒星时间.

在计划观测时，请确保将您的当地时间转换为Greenwich sidereal time 格林威治恒星时间。

3.Calculating Greenwich sidereal time 格林威治恒星时间 is essential for determining the best time for stargazing.

计算Greenwich sidereal time 格林威治恒星时间 对于确定最佳观星时间至关重要。

4.Astronomers use Greenwich sidereal time 格林威治恒星时间 to accurately track the positions of celestial bodies.

天文学家使用Greenwich sidereal time 格林威治恒星时间 来准确追踪天体的位置。

5.To synchronize telescopes, astronomers often refer to Greenwich sidereal time 格林威治恒星时间 as a universal standard.

为了同步望远镜，天文学家通常将Greenwich sidereal time 格林威治恒星时间 作为一个通用标准。

作文

Understanding time is crucial in our daily lives, and one of the most fascinating concepts related to time is the Greenwich sidereal time. This term refers to the time standard that is based on Earth's rotation relative to distant stars rather than the Sun. While most people are familiar with solar time, which is determined by the position of the Sun in the sky, Greenwich sidereal time offers a different perspective on how we measure time. The concept of sidereal time originates from the need for astronomers to track celestial objects. As Earth rotates on its axis, it takes approximately 24 hours to complete one full rotation relative to the Sun. However, due to Earth's orbit around the Sun, a day measured by the stars—known as a sidereal day—is about 23 hours, 56 minutes, and 4 seconds long. This slight difference is what makes Greenwich sidereal time essential for astronomers who need precise measurements when observing the night sky.The reference point for Greenwich sidereal time is the Prime Meridian, which runs through Greenwich, London. This imaginary line is significant because it serves as the basis for measuring longitude and time zones across the globe. When we refer to Greenwich sidereal time, we are essentially using this meridian as a starting point to determine the position of celestial objects at any given moment.For practical purposes, Greenwich sidereal time is often used in navigation and astronomy. It helps astronomers calculate the positions of stars and planets, making it easier to predict when these objects will be visible in the night sky. Additionally, sailors and navigators rely on sidereal time to accurately determine their positions at sea, especially before the advent of modern GPS technology.In contemporary times, the importance of Greenwich sidereal time extends beyond just astronomy and navigation. It also plays a role in satellite communication and space exploration. Satellites in orbit around Earth use sidereal time to maintain accurate positioning and synchronization with ground control. This ensures that data transmitted from satellites to Earth remains consistent and reliable.Moreover, understanding Greenwich sidereal time can enhance our appreciation of the universe. It reminds us that time is not just a human construct but is intricately tied to the cosmic dance of celestial bodies. As we look up at the stars, we are witnessing a universe that operates on its own time scale, independent of our earthly concerns.In conclusion, the concept of Greenwich sidereal time is a remarkable example of how time can be understood from different perspectives. It serves as a vital tool for astronomers, navigators, and scientists alike, allowing us to explore the cosmos with precision. By grasping the significance of Greenwich sidereal time, we can deepen our understanding of both time and the universe, connecting our daily lives to the vastness of the cosmos.

理解时间在我们的日常生活中至关重要，而与时间相关的一个最迷人的概念就是格林威治恒星时。这个术语指的是基于地球相对于遥远恒星的旋转而不是太阳的时间标准。虽然大多数人熟悉太阳时间，它是由太阳在天空中的位置决定的，但格林威治恒星时提供了我们测量时间的不同视角。恒星时间的概念源于天文学家需要追踪天体的需求。当地球绕其轴线旋转时，大约需要24小时完成一次完整的旋转，相对于太阳。然而，由于地球围绕太阳的轨道，按星星测量的一天——称为恒星日——大约是23小时56分钟和4秒。这一点微小的差异使得格林威治恒星时对需要精确测量夜空的天文学家至关重要。格林威治恒星时的参考点是通过伦敦格林威治的本初子午线。这条想象中的线非常重要，因为它作为测量全球经度和时区的基础。当我们提到格林威治恒星时时，我们基本上是在使用这条子午线作为起点来确定任何给定时刻天体的位置。在实际应用中，格林威治恒星时通常用于导航和天文学。它帮助天文学家计算星星和行星的位置，使他们更容易预测这些天体何时会在夜空中可见。此外，航海者和导航员依赖恒星时间准确确定他们在海上的位置，尤其是在现代GPS技术出现之前。在当代，格林威治恒星时的重要性不仅限于天文学和导航。它在卫星通信和太空探索中也发挥着作用。绕地球轨道运行的卫星使用恒星时间来保持准确的定位和与地面控制的同步。这确保了从卫星传输到地球的数据保持一致和可靠。此外，理解格林威治恒星时可以增强我们对宇宙的欣赏。它提醒我们，时间不仅仅是人类构造的，而是与天体的宇宙舞蹈密切相关。当我们仰望星空时，我们目睹的是一个在自己的时间尺度上运作的宇宙，与我们世俗的关注无关。总之，格林威治恒星时的概念是时间如何从不同视角理解的一个非凡例子。它是天文学家、导航员和科学家们的重要工具，使我们能够精确地探索宇宙。通过掌握格林威治恒星时的意义，我们可以加深对时间和宇宙的理解，将我们的日常生活与宇宙的广阔联系起来。