libration in longitude

简明释义

经天平动;

英英释义

例句

1.The libration in longitude 经度摆动 allows us to see about 59% of the moon's surface over time.

由于libration in longitude 经度摆动，我们能够在一段时间内看到大约59%的月球表面。

2.The study of libration in longitude 经度摆动 helps astronomers understand the moon's rotation.

对libration in longitude 经度摆动的研究帮助天文学家理解月球的自转。

3.The phenomenon of libration in longitude 经度摆动 occurs due to the elliptical orbit of the moon.

由于月球的椭圆轨道，libration in longitude 经度摆动现象发生。

4.By observing libration in longitude 经度摆动, scientists can predict the visibility of lunar features.

通过观察libration in longitude 经度摆动，科学家可以预测月球特征的可见性。

5.Understanding libration in longitude 经度摆动 is crucial for accurate lunar mapping.

理解libration in longitude 经度摆动对于准确的月球测绘至关重要。

作文

The moon has always fascinated humanity, not only because of its beauty but also due to its complex movements in the sky. One of the intriguing phenomena associated with the moon is what astronomers call libration in longitude. This term refers to the apparent oscillation of the moon as seen from Earth, which allows observers to glimpse slightly beyond the edge of the moon's visible hemisphere. Understanding libration in longitude is essential for comprehending the moon's rotation and its relationship with Earth.To begin with, the moon is tidally locked to Earth, meaning that it rotates on its axis at the same rate that it orbits our planet. As a result, the same side of the moon is always facing us. However, due to the elliptical shape of the moon's orbit and the tilt of its rotational axis, we can see about 59% of the lunar surface over time. This phenomenon is primarily caused by libration in longitude, which occurs when the moon moves along its orbit and causes slight variations in its position relative to Earth.The concept of libration in longitude can be understood better by considering the moon's orbit. As the moon travels around Earth, it does not move in a perfect circle. Instead, its orbit is elliptical, which means that its speed varies depending on its distance from Earth. When the moon is closer to Earth, it moves faster, and when it is farther away, it moves slower. This difference in speed causes a shift in the angle at which we observe the moon, leading to the apparent oscillation known as libration in longitude.Additionally, the tilt of the moon's axis contributes to this phenomenon. The moon's axial tilt is about 1.5 degrees relative to its orbital plane. This tilt, combined with the elliptical nature of its orbit, results in the moon appearing to sway back and forth slightly as it travels around Earth. This motion allows observers on Earth to see areas of the moon that would otherwise be hidden from view, thus enhancing our understanding of its geography and geology.The significance of libration in longitude extends beyond mere observation. It has practical implications for lunar exploration and mapping. For instance, knowing how much of the moon's surface can be seen at any given time helps scientists and engineers plan missions more effectively. When sending spacecraft to the moon, understanding the areas that are visible during different phases of libration can help ensure that landers and rovers are deployed to locations that are safe and scientifically valuable.In conclusion, libration in longitude is a fascinating astronomical phenomenon that enhances our understanding of the moon's motion and its relationship with Earth. By allowing us to see beyond the moon's familiar face, it provides valuable insights into its surface and composition. As we continue to explore the moon and conduct research, the knowledge gained from studying libration in longitude will undoubtedly play a crucial role in our quest to understand our celestial neighbor better. The moon remains an enduring symbol of wonder and curiosity, and phenomena like libration in longitude remind us of the complexities of the universe we inhabit.

月球一直吸引着人类的注意力，不仅因为它的美丽，还因为它在天空中的复杂运动。与月球相关的一个迷人现象是天文学家所称的经度摆动。这个术语指的是从地球上看，月球似乎在摇摆，这使得观察者能够稍微窥见月球可见半球的边缘。理解经度摆动对理解月球的旋转及其与地球的关系至关重要。首先，月球与地球是潮汐锁定的，这意味着它绕自身轴线的旋转速度与它绕地球的公转速度相同。因此，月球的同一面始终朝向我们。然而，由于月球轨道的椭圆形状和其旋转轴的倾斜，我们可以在一段时间内看到约59%的月球表面。这一现象主要是由经度摆动引起的，当月球沿轨道移动时，会导致其相对于地球的位置发生微小变化，从而使我们能够看到一些原本被遮挡的区域。要更好地理解经度摆动的概念，可以考虑月球的轨道。当月球围绕地球运动时，它并不是以完美的圆形轨道运动，而是以椭圆形轨道运动，这意味着它的速度会根据离地球的距离而变化。当月球靠近地球时，它的运动速度较快，而当它远离时，速度较慢。这种速度差异导致我们观察月球的角度发生变化，从而产生了被称为经度摆动的明显摇摆。此外，月球轴的倾斜也对这一现象有所贡献。月球的轴倾斜大约为1.5度，相对于其轨道平面。这个倾斜，加上其轨道的椭圆性质，使得月球在绕地球旅行时似乎轻微摇摆。这种运动使得地球上的观察者能够看到本来隐藏的月球区域，从而增强了我们对其地理和地质的理解。经度摆动的重要性不仅仅体现在观察上。它对月球探测和制图有实际意义。例如，了解在任何给定时刻可以看到多少月球表面，有助于科学家和工程师更有效地规划任务。在向月球发送航天器时，了解在不同摆动阶段可见的区域可以帮助确保着陆器和探测车部署到安全且具有科学价值的位置。总之，经度摆动是一个迷人的天文现象，增强了我们对月球运动及其与地球关系的理解。通过让我们看到月球熟悉面以外的地方，它提供了对其表面和成分的宝贵见解。随着我们继续探索月球并进行研究，从研究经度摆动中获得的知识无疑将在我们更好地理解这一天体邻居的过程中发挥至关重要的作用。月球仍然是一个充满奇迹和好奇心的象征，而像经度摆动这样的现象提醒我们我们所栖息的宇宙的复杂性。