pericenter

简明释义

英[/ˈpɛrɪˌsɛntər/]美[/ˈpɛrɪˌsɛntər/]

n. 近中心点；[物] 近心点

英英释义

单词用法

同义词

反义词

例句

1.He tried to find out the longitude of pericenter.

他试图找出中心点的经度。

2.He tried to find out the longitude of pericenter.

他试图找出中心点的经度。

3.Astronomers calculated the pericenter 近日点 of the comet's orbit to predict its next appearance.

天文学家计算了彗星轨道的pericenter 近日点以预测其下次出现的时间。

4.The mission was designed to study the effects of gravity at the pericenter 近日点 of the asteroid's orbit.

该任务旨在研究小行星轨道的pericenter 近日点处的重力效应。

5.The spacecraft reached its pericenter 近日点 around the planet, allowing scientists to gather crucial data.

宇宙飞船在行星周围达到了它的pericenter 近日点，使科学家能够收集重要数据。

6.As the planet approached its pericenter 近日点, its atmosphere began to change dramatically.

当行星接近它的pericenter 近日点时，它的气候开始发生剧烈变化。

7.During the satellite's orbit, the pericenter 近日点 is the point where it is closest to Earth.

在卫星的轨道中，pericenter 近日点是它离地球最近的点。

作文

In the realm of astronomy, understanding various terminologies is crucial for comprehending the intricate dynamics of celestial bodies. One such term is pericenter, which refers to the point in an orbit that is closest to the body being orbited. This concept plays a significant role in the study of orbits, whether they are planetary, lunar, or even artificial satellites. The pericenter is essential for calculating the gravitational forces at play and predicting the behavior of objects in space.For instance, consider the Earth’s orbit around the Sun. The point at which Earth is closest to the Sun is known as perihelion, which is a specific type of pericenter. This occurs around early January each year when Earth is approximately 147 million kilometers from the Sun. Understanding this distance is vital for astronomers as it affects the amount of solar energy received by our planet, influencing seasonal changes and climate patterns.Similarly, the Moon orbits the Earth, and its pericenter is referred to as perigee. When the Moon reaches its perigee, it is about 363,300 kilometers away from Earth. This distance can affect phenomena such as tides and the appearance of the Moon in the night sky. During a supermoon, when the full moon coincides with its perigee, the Moon appears larger and brighter than usual, captivating observers around the world.Artificial satellites also experience pericenter in their orbits. For instance, a satellite in a low Earth orbit will have a pericenter that brings it closer to the Earth’s surface, allowing for detailed imaging and data collection. These satellites are crucial for various applications, including weather forecasting, environmental monitoring, and global communication. The precise calculation of a satellite's pericenter ensures that it maintains the correct orbit and achieves its mission objectives effectively.The concept of pericenter is not only limited to the physical distances between celestial bodies; it also encompasses the gravitational interactions that occur at these points. At the pericenter, the gravitational pull is stronger, which can lead to increased speeds as the orbiting body accelerates due to the close proximity to the massive object it orbits. This phenomenon is described by Kepler's laws of planetary motion, which outline how planets move in elliptical orbits with varying speeds.Furthermore, understanding the pericenter is vital for space missions. When planning trajectories for spacecraft, engineers must calculate the pericenter to ensure that the craft can achieve optimal speeds and energy efficiency during its journey. For example, during a mission to Mars, a spacecraft may use a gravity assist maneuver at the pericenter of another planet to gain additional velocity without expending extra fuel.In conclusion, the term pericenter is fundamental in the field of astronomy and space exploration. It represents the closest point in an orbit, influencing various aspects of celestial mechanics, including gravitational forces, orbital dynamics, and mission planning. By grasping the significance of pericenter, we can better appreciate the complexities of our universe and the intricate movements of the bodies within it. As we continue to explore space, the understanding of such terms will remain essential for future discoveries and advancements in our knowledge of the cosmos.

在天文学领域，理解各种术语对于理解天体的复杂动态至关重要。其中一个术语是pericenter，指的是轨道中离被绕动天体最近的点。这个概念在研究轨道时发挥着重要作用，无论是行星、月球还是人工卫星。pericenter对于计算作用于天体的引力和预测太空中物体的行为至关重要。例如，考虑地球绕太阳的轨道。地球离太阳最近的点被称为近日点，这是pericenter的一种特定类型。每年1月初左右，这一现象会发生，此时地球与太阳的距离约为1.47亿公里。理解这个距离对天文学家来说至关重要，因为它影响我们星球接收到的太阳能量，从而影响季节变化和气候模式。同样，月球绕地球运行，其pericenter被称为近地点。当月球到达近地点时，它距离地球约363,300公里。这个距离会影响潮汐现象以及夜空中月亮的外观。在超级月亮期间，当满月与近地点重合时，月亮看起来比平常更大、更亮，吸引了全世界观察者的目光。人工卫星在其轨道中也会经历pericenter。例如，在低地球轨道中的卫星将具有一个使其更靠近地球表面的pericenter，从而允许进行详细成像和数据收集。这些卫星对各种应用至关重要，包括天气预报、环境监测和全球通信。精确计算卫星的pericenter确保其维持正确的轨道并有效实现其任务目标。pericenter的概念不仅限于天体之间的物理距离；它还包含在这些点上发生的引力相互作用。在pericenter处，引力更强，这可能导致由于靠近其绕动的巨大物体而加速的速度增加。这种现象由开普勒的行星运动定律描述，后者概述了行星如何以椭圆轨道运动，速度各不相同。此外，理解pericenter对于太空任务至关重要。在为航天器规划轨道时，工程师必须计算pericenter以确保航天器在旅途中能够达到最佳速度和能效。例如，在前往火星的任务中，航天器可能会在另一颗行星的pericenter处使用引力助推操作，以在不额外消耗燃料的情况下获得额外的速度。总之，术语pericenter在天文学和太空探索领域是基础性的。它代表了轨道中最近的点，影响着引力、轨道动力学和任务规划等多个方面。通过掌握pericenter的重要性，我们可以更好地欣赏宇宙的复杂性以及其中天体的精细运动。随着我们继续探索太空，对这些术语的理解将仍然是未来发现和推动我们对宇宙知识的进步的关键。