apsis

简明释义

英[ˈæpsɪs]美[ˈæpsɪs]

n. 教堂东端之半圆室；[天] 拱点

复 数 a p s i d e s

英英释义

单词用法

同义词

反义词

例句

1.Astronomers often calculate the time it takes for a comet to travel between its periapsis and apoapsis.

天文学家常常计算彗星在近日点和远日点之间旅行所需的时间。

2.The spacecraft's trajectory was adjusted to ensure it would pass through the desired apsis during its flyby.

航天器的轨道被调整，以确保它在飞掠时经过所需的apsis（天体的近点或远点）。

3.The orbit of the planet reaches its closest point to the sun at the periapsis and its farthest point at the apoapsis.

行星的轨道在近日点达到离太阳最近的点，在远日点达到最远的点。

4.The elliptical shape of the orbit means that the distance from the star varies between the two apsis points.

轨道的椭圆形状意味着距离恒星在两个apsis（天体的近点或远点）之间变化。

5.Understanding the concept of apsis is crucial for predicting satellite orbits.

理解apsis（天体的近点或远点）的概念对于预测卫星轨道至关重要。

作文

The concept of an apsis is often overlooked in everyday discussions about astronomy, yet it plays a crucial role in understanding the orbits of celestial bodies. An apsis refers to either of the two points in an orbit where a body is closest to or farthest from the object it is orbiting. In simpler terms, it marks the extremes of an orbiting object's distance from its central star or planet. For instance, when we talk about Earth’s orbit around the Sun, the point at which Earth is closest to the Sun is known as perihelion, while the point farthest away is called aphelion. Both of these points are specific examples of an apsis.Understanding apsis is essential for several reasons. Firstly, it has significant implications for the gravitational forces that act on celestial bodies. At the perihelion, the gravitational pull is stronger due to the closer proximity to the Sun, which results in faster orbital speeds according to Kepler's laws of planetary motion. Conversely, at aphelion, the gravitational pull weakens, causing the orbital speed to decrease. This variation in speed can affect seasonal changes on Earth and the climate over long periods.Moreover, the concept of apsis is not limited to planets and stars; it also applies to satellites and moons. For example, the Moon's orbit around Earth has its own apsis points: perigee (closest point) and apogee (farthest point). Understanding these points is vital for satellite operations, especially for those that require precise positioning for communication, navigation, or scientific observation.In addition, the study of apsis extends beyond mere academic interest; it has practical applications in various fields. For instance, in space exploration, knowing the apsis of a spacecraft's orbit can help mission planners determine the best times for launching, maneuvering, and conducting experiments. Engineers and scientists must account for the changing distances and speeds to ensure the success of their missions.Furthermore, the concept of apsis has philosophical implications. It invites us to reflect on the nature of our universe and our place within it. The idea that celestial bodies have predictable paths and defined points of closeness and distance can be seen as a metaphor for human relationships. Just as planets experience their own cycles of proximity and distance, so too do we in our interactions with others. Understanding this dynamic can lead to deeper insights into how we connect with those around us.In conclusion, the term apsis may seem technical, but its significance reaches far beyond the realm of astronomy. From influencing the behavior of planets and moons to affecting our technological advancements and philosophical perspectives, apsis serves as a reminder of the intricate dance of celestial mechanics. By deepening our understanding of such concepts, we gain a greater appreciation for the complexities of the universe and our role within it. As we continue to explore the cosmos, let us not forget the importance of the apsis in shaping our knowledge and experiences in this vast expanse of space.

‘apsis’这个概念在日常天文学讨论中常常被忽视，但它在理解天体轨道方面扮演着至关重要的角色。‘apsis’指的是在轨道上一个天体距离其所绕行的中心天体最近或最远的两个点之一。简单来说，它标志着一个轨道物体与其中央恒星或行星之间距离的极端。例如，当我们谈论地球围绕太阳的轨道时，地球距离太阳最近的点称为近日点，而最远的点称为远日点。这两个点都是‘apsis’的具体例子。理解‘apsis’是非常重要的，原因有很多。首先，它对作用于天体的引力有重大影响。在近日点时，由于与太阳的距离更近，引力更强，这导致根据开普勒的行星运动定律，轨道速度更快。相反，在远日点时，引力减弱，导致轨道速度下降。这种速度的变化可以影响地球的季节变化以及长期的气候。此外，‘apsis’的概念不仅限于行星和恒星；它同样适用于卫星和月球。例如，月球围绕地球的轨道也有自己的‘apsis’点：近地点（最近点）和远地点（最远点）。理解这些点对于卫星操作至关重要，尤其是那些需要精确定位以进行通信、导航或科学观察的卫星。而且，‘apsis’的研究超出了学术兴趣；它在多个领域都有实际应用。例如，在太空探索中，了解航天器轨道的‘apsis’可以帮助任务规划者确定最佳的发射、机动和实验时间。工程师和科学家必须考虑不断变化的距离和速度，以确保他们任务的成功。此外，‘apsis’的概念还具有哲学意义。它促使我们反思宇宙的本质以及我们在其中的位置。天体有可预测的路径和定义的亲密与距离点，这一观点可以被视为人际关系的隐喻。正如行星经历亲密和距离的周期一样，我们在与他人的互动中也会如此。理解这种动态可以让我们对周围人的连接有更深刻的洞察。总之，‘apsis’这个术语看似技术性，但其重要性远远超出了天文学的范畴。从影响行星和月球的行为到影响我们的技术进步和哲学视角，‘apsis’提醒我们天体力学的复杂舞蹈。通过加深对这些概念的理解，我们对宇宙的复杂性和我们在其中的角色有了更大的欣赏。随着我们继续探索宇宙，让我们不要忘记‘apsis’在塑造我们对这一广阔空间的知识和体验中的重要性。