periapsis

简明释义

英[ˌperɪˈæpsɪs]美[ˌperɪˈæpsɪs]

n. [天] 近拱点

复 数 p e r i a p s e s

英英释义

单词用法

同义词

反义词

例句

1.Periapsis in earth orbit; the point in its orbit where a satellite is nearest to the earth.

以地球为中心的最近点；人造卫星轨道上离地球中心最近的点。

2.The repeated thrust applications at apoapsis would raise periapsis from inside to outside the stationary orbit.

重复在远心点施以推力，会将近心点由同步轨道内提升到同步轨道外。

3.The repeated thrust applications at apoapsis would raise periapsis from inside to outside the stationary orbit.

重复在远心点施以推力，会将近心点由同步轨道内提升到同步轨道外。

4.At periapsis 近日点, the satellite experiences increased gravitational forces.

在近日点，卫星经历了增强的引力作用。

5.Astronomers calculated the periapsis 近日点 of the comet's orbit to predict its path.

天文学家计算了彗星轨道的近日点以预测其路径。

6.During its flyby, the probe will pass closest to the planet at periapsis 近日点.

在飞掠过程中，探测器将在近日点处最接近行星。

7.The spacecraft will reach its periapsis 近日点 during the next orbit.

这艘航天器将在下一个轨道中到达它的近日点。

8.The mission control team monitored the periapsis 近日点 closely for any anomalies.

任务控制团队密切监视近日点以发现任何异常情况。

作文

In the vast expanse of our universe, celestial bodies engage in intricate dances governed by the laws of physics. Among these phenomena, the term periapsis (近日点) holds significant importance in understanding the orbits of planets, moons, and artificial satellites. The periapsis is defined as the point in the orbit of an object where it is closest to the body it is orbiting. This concept is crucial in both astronomy and space exploration, as it influences the gravitational interactions and the velocity of the orbiting object.For instance, consider the Earth and its moon. The moon travels around the Earth in an elliptical orbit, which means that its distance from our planet varies over time. At certain points in this orbit, the moon reaches its periapsis, where it is approximately 363,300 kilometers away from Earth. This proximity has various effects, including higher tidal forces and increased visibility of the moon in the night sky.The significance of the periapsis extends beyond natural satellites; it is also pivotal for spacecraft missions. When a spacecraft approaches a planet or moon, mission planners carefully calculate the periapsis to ensure that the vehicle can gather data effectively while minimizing fuel consumption. For example, during the Mars Orbiter Mission, the spacecraft was designed to enter a highly elliptical orbit around Mars, with a periapsis that allowed it to pass close to the Martian surface for detailed observations.Moreover, the periapsis plays a critical role in the stability of orbits. If an object approaches its periapsis too quickly or at an incorrect angle, it risks being pulled into the gravitational field of the larger body, potentially leading to a crash. Therefore, understanding the dynamics of periapsis is essential for the success of space missions and the safety of spacecraft.In addition to its practical applications, the concept of periapsis invites us to reflect on the broader implications of our place in the universe. As we send more probes and satellites into space, we gain insights into the formation of planetary systems and the potential for life beyond Earth. Each calculation of periapsis not only aids in our understanding of celestial mechanics but also inspires future generations to explore the cosmos.In conclusion, the term periapsis encapsulates a fundamental aspect of orbital mechanics, representing the closest point of approach between an orbiting object and the body it revolves around. Its relevance spans from the natural movements of moons and planets to the meticulous planning of space missions. By grasping the concept of periapsis, we enhance our comprehension of the universe's complexities and our quest for knowledge beyond our planet. As we continue to explore the stars, the significance of periapsis will undoubtedly remain a cornerstone of our astronomical endeavors.

在我们广袤的宇宙中，天体以复杂的舞蹈形式遵循物理法则。在这些现象中，术语periapsis（近日点）在理解行星、卫星和人造卫星的轨道中具有重要意义。periapsis被定义为一个物体在其轨道上距离其所绕行的天体最近的点。这个概念在天文学和太空探索中至关重要，因为它影响着轨道物体的引力相互作用和速度。例如，考虑地球和它的月球。月球围绕地球以椭圆轨道运行，这意味着它与我们星球的距离随时间变化。在这个轨道的某些点上，月球到达其periapsis，此时它距离地球约363,300公里。这种接近度有各种影响，包括更高的潮汐力量和在夜空中月亮的更高可见性。periapsis的重要性不仅限于自然卫星；它对航天器任务也至关重要。当航天器接近一个行星或月球时，任务规划者会仔细计算periapsis，以确保飞行器能够有效收集数据，同时最小化燃料消耗。例如，在火星轨道器任务中，航天器被设计成围绕火星进入一个高度椭圆的轨道，periapsis允许它在火星表面附近经过，以便进行详细观察。此外，periapsis在轨道稳定性方面发挥着关键作用。如果一个物体以过快的速度或错误的角度接近其periapsis，它就有可能被较大天体的引力场吸引，可能导致碰撞。因此，理解periapsis的动态对于太空任务的成功及航天器的安全至关重要。除了其实际应用外，periapsis的概念也促使我们反思我们在宇宙中的位置。随着我们向太空发射更多探测器和卫星，我们获得了有关行星系统形成和地球以外生命潜力的见解。每一次对periapsis的计算不仅有助于我们理解天体力学，还激励着未来几代人探索宇宙。总之，术语periapsis概括了轨道力学的一个基本方面，代表了一个轨道物体与其旋转体之间的最近接近点。它的相关性从自然运动的月球和行星延伸到太空任务的细致规划。通过掌握periapsis的概念，我们增强了对宇宙复杂性的理解，以及我们对知识的追求，超越了我们的星球。随着我们继续探索星星，periapsis的重要性无疑将成为我们天文学努力的基石。