sidereal unit

简明释义

恒星日单位

英英释义

例句

1.A sidereal unit is approximately 23 hours and 56 minutes long, slightly shorter than a solar day.

恒星单位大约为23小时56分钟，比太阳日稍短。

2.The sidereal unit of time is crucial for astronomers when calculating the positions of celestial bodies.

对于天文学家来说，恒星单位的时间在计算天体的位置时至关重要。

3.The concept of sidereal unit is essential for understanding the motion of galaxies.

恒星单位的概念对于理解银河系的运动至关重要。

4.In astronomy, a day can be measured in terms of a sidereal unit, which is based on the Earth's rotation relative to distant stars.

在天文学中，一天可以用恒星单位来测量，该单位基于地球相对于遥远星星的自转。

5.Using a sidereal unit helps to achieve more accurate results in orbital mechanics.

使用恒星单位有助于在轨道力学中获得更准确的结果。

作文

In the vast expanse of the universe, time is measured in various ways, reflecting the celestial movements that govern our existence. One such measurement is the concept of a sidereal unit, which plays a crucial role in astronomy and our understanding of time. A sidereal unit refers to the time it takes for the Earth to rotate once on its axis relative to the distant stars, rather than the Sun. This period is approximately 23 hours, 56 minutes, and 4 seconds. Understanding this unit of time is essential for astronomers as it allows them to accurately track the positions of celestial bodies and understand their movements in relation to our planet.The significance of the sidereal unit extends beyond mere measurements; it also influences our perception of time. For instance, while we commonly use solar days—based on the position of the Sun in the sky—the sidereal unit aligns more closely with the actual rotation of the Earth in space. This distinction is vital when observing celestial events, such as eclipses or the transits of planets across the night sky. Without the understanding of sidereal units, our ability to predict and comprehend these phenomena would be severely hindered.Moreover, the sidereal unit serves as a foundation for various astronomical calculations. For example, when calculating the orbits of planets or the timing of satellite launches, scientists must account for the sidereal unit to ensure precision. The difference between a solar day and a sidereal unit can lead to significant discrepancies if not properly considered. Therefore, astronomers and astrophysicists rely heavily on this unit to maintain accuracy in their work.In addition to its scientific applications, the sidereal unit also has cultural implications. Ancient civilizations, such as the Babylonians and the Mayans, utilized their understanding of the stars and celestial movements to create calendars and agricultural practices. They recognized the importance of the sidereal unit in determining the best times for planting and harvesting crops, thereby intertwining their societal rhythms with the cosmos. This historical context highlights how deeply interwoven our lives are with the celestial mechanics that govern time.As we delve deeper into the mysteries of the universe, the sidereal unit remains a fundamental concept that bridges the gap between science and culture. It serves as a reminder of our connection to the stars and the intricate dance of celestial bodies that influence life on Earth. In an age where technology allows us to explore the far reaches of space, understanding the sidereal unit becomes even more critical. It not only enhances our knowledge of the universe but also enriches our appreciation of the natural world around us.In conclusion, the sidereal unit is more than just a measure of time; it is a key to unlocking the secrets of the cosmos. Its implications span across scientific, cultural, and historical domains, reminding us of the profound relationship between our planet and the universe. As we continue to explore and learn, the sidereal unit will undoubtedly remain a cornerstone of astronomical study, guiding us through the ever-expanding frontier of knowledge about our place in the cosmos.

在宇宙的广阔空间中，时间以多种方式被测量，这反映了支配我们存在的天体运动。其中一个测量就是恒星单位的概念，它在天文学和我们对时间的理解中起着至关重要的作用。恒星单位指的是地球相对于遥远星星旋转一次所需的时间，而不是相对于太阳的时间。这个周期大约是23小时56分钟和4秒。理解这个时间单位对于天文学家来说至关重要，因为它使他们能够准确跟踪天体的位置，并理解它们相对于我们星球的运动。恒星单位的重要性不仅仅体现在测量上；它还影响着我们对时间的感知。例如，当我们通常使用基于太阳在天空中位置的太阳日时，恒星单位则更贴近地球在太空中的实际旋转。这一区别在观察天文事件时至关重要，比如日食或行星在夜空中的横穿。如果没有对恒星单位的理解，我们预测和理解这些现象的能力将受到严重阻碍。此外，恒星单位作为各种天文计算的基础。例如，在计算行星轨道或卫星发射的时机时，科学家必须考虑恒星单位以确保精确性。如果不正确考虑太阳日和恒星单位之间的差异，可能会导致显著的误差。因此，天文学家和天体物理学家在工作中高度依赖这一单位，以保持准确性。除了科学应用，恒星单位还有文化意义。古代文明，如巴比伦人和玛雅人，利用他们对星星和天体运动的理解来创建日历和农业实践。他们认识到恒星单位在确定最佳播种和收获时间方面的重要性，从而将他们的社会节奏与宇宙交织在一起。这一历史背景突显了我们的生活与支配时间的天体力学之间的深刻联系。随着我们深入探索宇宙的奥秘，恒星单位仍然是一个基本概念，架起了科学与文化之间的桥梁。它提醒我们与星星的联系以及影响地球生命的天体之间复杂的舞蹈。在一个技术让我们能够探索太空遥远边界的时代，理解恒星单位变得更加重要。它不仅增强了我们对宇宙的知识，还丰富了我们对周围自然世界的欣赏。总之，恒星单位不仅仅是一个时间的度量；它是解锁宇宙秘密的关键。它的影响跨越科学、文化和历史领域，提醒我们我们的星球与宇宙之间深刻的关系。随着我们不断探索和学习，恒星单位无疑将继续成为天文学研究的基石，引导我们穿越关于我们在宇宙中位置的知识不断扩展的边界。