fixed sidereal day

简明释义

固定恒星日

英英释义

例句

1.Telescopes are often calibrated based on the fixed sidereal day to track celestial objects efficiently.

望远镜通常根据固定恒星日进行校准，以高效追踪天体。

2.The rotation of the Earth is measured in terms of a fixed sidereal day, which is crucial for timekeeping.

地球的自转以固定恒星日为单位进行测量，这对计时至关重要。

3.In navigation, understanding the fixed sidereal day helps sailors determine their longitude accurately.

在导航中，理解固定恒星日有助于水手准确确定他们的经度。

4.A fixed sidereal day lasts approximately 23 hours and 56 minutes, which is shorter than the solar day.

固定恒星日大约持续23小时56分钟，比太阳日短。

5.The concept of a fixed sidereal day is essential for astronomers when calculating the positions of stars.

对于天文学家来说，固定恒星日的概念在计算星体位置时至关重要。

作文

The concept of a fixed sidereal day is crucial in understanding the movements of celestial bodies and their relationship with time. A fixed sidereal day is defined as the time it takes for the Earth to rotate once on its axis relative to the distant stars. This period lasts approximately 23 hours, 56 minutes, and 4 seconds. Unlike the solar day, which is based on the position of the sun and lasts about 24 hours, the fixed sidereal day is measured against the backdrop of the cosmos. This distinction is essential for astronomers and navigators who rely on precise measurements of time and position in space.To grasp the significance of a fixed sidereal day, one must first understand the Earth's rotation. As the Earth spins, it also orbits around the sun. This dual motion causes the sun to appear to rise and set at different times each day. However, when we consider the stars, which are so far away that their positions do not change significantly in the short term, the fixed sidereal day provides a more consistent measure of time. For example, if you were to observe a particular star at a specific time one night, you would find that it appears in the same position in the sky about 23 hours and 56 minutes later.The implications of the fixed sidereal day extend beyond mere observation. It plays an essential role in various fields such as astronomy, astrophysics, and even satellite navigation. For astronomers, understanding the fixed sidereal day allows them to accurately track celestial objects and predict their movements. This knowledge is vital for missions that involve space exploration or satellite deployment, where precise timing can mean the difference between success and failure.Moreover, the fixed sidereal day is fundamental in the development of timekeeping systems. Traditional clocks are designed around the solar day, but scientists and engineers have developed systems that take the fixed sidereal day into account, particularly in fields where accuracy is paramount. For instance, Global Positioning System (GPS) satellites use atomic clocks that are calibrated to sidereal time, ensuring that they can provide accurate location data regardless of Earth’s rotation and orbital variations.In addition to its scientific importance, the concept of a fixed sidereal day invites philosophical reflections on our perception of time. While we often think of time in terms of days and nights dictated by the sun, the reality is much more complex. The universe operates on a scale that transcends our daily experiences, and the fixed sidereal day serves as a reminder of this vastness. It challenges us to reconsider how we measure time and our place within the cosmos.In conclusion, the fixed sidereal day is a fundamental concept in both science and philosophy. It represents a unit of time that is rooted in the movements of the stars, distinct from the solar day we experience on Earth. Understanding the fixed sidereal day enhances our comprehension of celestial mechanics, improves our navigation systems, and encourages deeper contemplation about the nature of time itself. As we continue to explore the universe, the fixed sidereal day will remain a vital reference point in our quest for knowledge and understanding of the cosmos.

“固定恒星日”的概念对于理解天体的运动及其与时间的关系至关重要。“固定恒星日”被定义为地球相对于遥远星体自转一周所需的时间。这个周期大约为23小时56分钟04秒。与基于太阳位置且持续约24小时的太阳日不同，“固定恒星日”是相对于宇宙背景进行测量的。这一区别对于依赖精确时间和空间位置测量的天文学家和导航员来说至关重要。要理解“固定恒星日”的重要性，首先必须了解地球的自转。当地球自转时，它也围绕太阳公转。这种双重运动导致太阳每天的升起和落下时间各不相同。然而，当我们考虑到星星时，由于它们距离遥远，其位置在短期内不会显著变化，因此“固定恒星日”提供了一个更一致的时间测量。例如，如果你在某个夜晚特定时间观察某颗星星，你会发现大约23小时56分钟后，它在天空中的位置与之前相同。“固定恒星日”的影响超越了单纯的观察。它在天文学、天体物理学甚至卫星导航等多个领域中发挥着重要作用。对于天文学家来说，理解“固定恒星日”使他们能够准确追踪天体并预测其运动。这一知识对于涉及太空探索或卫星部署的任务至关重要，因为精确的时机可能意味着成功与失败之间的差异。此外，“固定恒星日”在时间计量系统的发展中也是基础。传统时钟是围绕太阳日设计的，但科学家和工程师已经开发出考虑“固定恒星日”的系统，特别是在需要高精度的领域。例如，全球定位系统（GPS）卫星使用经过校准的原子钟，以确保它们能够提供准确的位置数据，无论地球的自转和轨道变化如何。除了其科学重要性之外，“固定恒星日”的概念还引发了对我们时间感知的哲学思考。虽然我们常常以太阳主导的昼夜来思考时间，但现实要复杂得多。宇宙在超越我们日常经验的尺度上运作，而“固定恒星日”提醒我们这一广袤性。它促使我们重新考虑如何测量时间以及我们在宇宙中的位置。总之，“固定恒星日”在科学和哲学中都是一个基本概念。它代表了一种根植于星体运动的时间单位，与我们在地球上经历的太阳日截然不同。理解“固定恒星日”增强了我们对天体力学的理解，改善了我们的导航系统，并鼓励我们更深入地思考时间的本质。随着我们继续探索宇宙，“固定恒星日”将始终是我们追求知识和理解宇宙的重要参考点。