apparent precession

简明释义

视进动;

英英释义

例句

1.Astronomers often calculate the apparent precession of stars to refine their models of the universe.

天文学家常常计算星星的表观进动以优化他们的宇宙模型。

2.The study of planetary motion reveals the phenomenon of apparent precession, which refers to the observed shift in the position of celestial objects over time.

对行星运动的研究揭示了表观进动这一现象，它指的是天体位置随时间变化的观察到的偏移。

3.The concept of apparent precession is crucial for navigators who rely on celestial navigation.

对于依赖天文导航的航海者来说，表观进动的概念至关重要。

4.The apparent precession of the equinoxes is a key factor in understanding climate change over millennia.

春分点的表观进动是理解千年气候变化的关键因素。

5.In physics, the apparent precession of a spinning top can be observed when external forces act on it.

在物理学中，当外力作用于旋转陀螺时，可以观察到其表观进动。

作文

In the realm of astronomy, the concept of apparent precession is crucial for understanding the movement of celestial bodies. This phenomenon refers to the apparent shift in the position of an object in the sky due to the motion of the observer or the rotation of the Earth itself. The term 'precession' typically describes the gradual change or movement of the axis of a spinning body, and when we talk about apparent precession, we are focusing on how this movement can influence our perception of stars and planets from our vantage point on Earth.To illustrate, consider the case of the North Star, Polaris. As the Earth rotates on its axis, different stars become visible at different times of the night. However, the Earth's axial tilt and its orbit around the Sun cause a slight wobble in its rotation, leading to what we call precession. Over long periods, this wobble alters the orientation of the Earth's axis, which means that the position of stars like Polaris will appear to change over time. This is where apparent precession comes into play; it is not the stars themselves moving significantly, but rather our perspective that shifts due to the Earth's own movements.Understanding apparent precession is essential for astronomers and navigators alike. For instance, ancient mariners relied on the fixed positions of stars for navigation. However, as precession occurs, the stars they relied upon would gradually shift position, making it necessary for them to adapt their navigation methods. This adaptation is a testament to the dynamic nature of our universe and the importance of understanding celestial mechanics.Moreover, apparent precession also affects how we perceive the constellations. Over thousands of years, the patterns that we associate with certain groups of stars will change. This means that the stories and myths tied to these constellations may become less relevant as the stars shift in relation to one another. For example, the Zodiac signs we use today were defined thousands of years ago, and due to apparent precession, the actual positions of these constellations have shifted significantly since then.In addition to its implications for navigation and mythology, apparent precession has scientific significance as well. It plays a role in understanding climate changes over geological time scales. The Milankovitch cycles, which describe how variations in Earth's orbit and axial tilt affect climate, are partly influenced by precessional movements. By studying these cycles, scientists can gain insight into past climate conditions and make predictions about future changes.In conclusion, the concept of apparent precession is more than just a technical term; it encapsulates a fundamental aspect of how we observe and interact with the cosmos. From ancient navigation practices to modern scientific research, understanding this phenomenon allows us to appreciate the intricate dance of celestial bodies and the dynamic nature of our universe. As we continue to explore the cosmos, the knowledge of apparent precession will undoubtedly remain a vital component of our astronomical toolkit.

在天文学领域，表观进动的概念对于理解天体的运动至关重要。这一现象指的是由于观察者的运动或地球本身的旋转而导致天空中物体位置的表观变化。术语“进动”通常描述的是旋转物体轴线的逐渐变化或运动，而当我们谈论表观进动时，我们关注的是这种运动如何影响我们从地球上的视角对星星和行星的感知。例如，考虑北极星（Polaris）的情况。当地球在其轴上旋转时，不同的星星会在不同的时间出现在夜空中。然而，地球的轴倾斜和围绕太阳的轨道运动导致其旋转出现轻微的摇摆，从而产生我们所称的进动。随着时间的推移，这种摇摆改变了地球轴线的方向，这意味着像北极星这样的星星的位置会随着时间的推移而显得有所变化。这就是表观进动的作用；并不是星星本身发生了显著移动，而是由于地球自身的运动，我们的视角发生了变化。理解表观进动对天文学家和航海者来说至关重要。例如，古代水手依赖星星的固定位置进行导航。然而，随着进动的发生，他们依赖的星星会逐渐改变位置，这使得他们必须调整导航方法。这种适应体现了我们宇宙的动态特性以及理解天体力学的重要性。此外，表观进动还影响我们对星座的感知。经过数千年的时间，我们与某些星星组关联的模式将会发生变化。这意味着与这些星座相关的故事和神话可能会变得不那么相关，因为星星在彼此之间的关系发生了变化。例如，我们今天使用的黄道星座是在数千年前定义的，由于表观进动，这些星座的实际位置自那时以来已经发生了显著的变化。除了对导航和神话的影响外，表观进动在科学上也具有重要意义。它在理解地质时间尺度上的气候变化中起着作用。米兰科维奇周期（Milankovitch cycles）描述了地球轨道和轴倾斜的变化如何影响气候，这在一定程度上受进动运动的影响。通过研究这些周期，科学家可以深入了解过去的气候条件，并对未来变化做出预测。总之，表观进动的概念不仅仅是一个技术术语；它概括了我们观察和与宇宙互动的基本方面。从古代的导航实践到现代科学研究，理解这一现象让我们能够欣赏天体的复杂舞蹈和我们宇宙的动态特性。随着我们继续探索宇宙，表观进动的知识无疑将继续成为我们天文学工具箱中的一个重要组成部分。