greatest elongation

简明释义

大距

英英释义

例句

1.During the greatest elongation, the visibility of the inner planets improves significantly.

在最大延伸期间，内行星的可见性显著提高。

2.Astronomers often observe Mercury at its greatest elongation to study its orbit more effectively.

天文学家通常在水星达到最大延伸时观察它，以更有效地研究其轨道。

3.Understanding the timing of greatest elongation helps stargazers plan their observations.

了解最大延伸的时间有助于观星者规划他们的观察活动。

4.The greatest elongation of a planet can be predicted using astronomical calculations.

行星的最大延伸可以通过天文计算进行预测。

5.The planet Venus reaches its greatest elongation when it appears farthest from the Sun in the evening sky.

当金星在黄昏的天空中看起来离太阳最远时，它达到了最大延伸。

作文

The concept of celestial mechanics often introduces us to various terms that describe the positions and movements of celestial bodies. One such term is greatest elongation, which refers to the position of a planet when it is at its maximum angular distance from the Sun as seen from Earth. This phenomenon is particularly significant when discussing inferior planets, such as Mercury and Venus, which orbit closer to the Sun than Earth. Understanding greatest elongation can enhance our appreciation of astronomical events and the dynamics of our solar system.When we observe the night sky, we often notice bright objects that stand out among the stars. These objects can be planets, and their visibility is influenced by their positions relative to the Sun and Earth. The greatest elongation of a planet occurs when it appears furthest from the Sun in the sky, making it easier to spot with the naked eye. For instance, during the greatest elongation of Mercury, it can be seen in the evening or morning sky, depending on whether it is east or west of the Sun.The timing of greatest elongation varies for each planet. Mercury experiences this event approximately every 116 days, while Venus has a longer cycle of about 584 days. This periodicity is due to the differing orbital speeds of the planets. By tracking these elongations, astronomers can predict when the planets will be most visible and plan observations accordingly.The significance of greatest elongation extends beyond mere visibility. It also provides insights into the orbital mechanics of the planets. When a planet reaches its greatest elongation, it is often at a point in its orbit where gravitational forces are balanced. This balance allows astronomers to study the planet's motion and understand its trajectory more accurately.Moreover, the greatest elongation of planets can also influence their brightness. When a planet is at its maximum distance from the Sun, it reflects more sunlight, making it appear brighter in the night sky. This brightness can vary significantly between different elongations, which is why some evenings we may find certain planets particularly dazzling.In addition to its scientific importance, the greatest elongation has cultural and historical significance. Throughout history, various civilizations have observed the movements of planets and incorporated them into their calendars and mythologies. The visibility of planets during their greatest elongation would have been noted by ancient astronomers, influencing agricultural practices and religious rituals.In conclusion, the term greatest elongation encapsulates a vital aspect of planetary observation. It describes the moment when a planet is most distant from the Sun in the sky, allowing for optimal visibility and study. By understanding this concept, we not only enhance our knowledge of astronomy but also connect with the rich history of human observation of the cosmos. As we look up at the night sky, the next time we see a bright planet shining brightly, we might just be witnessing its greatest elongation.

天体力学的概念常常向我们介绍各种术语，这些术语描述了天体的位置和运动。其中一个术语是最大延伸，它指的是一颗行星在从地球看时与太阳的最大角距离。这种现象在讨论像水星和金星这样的内行星时尤为重要，因为它们的轨道比地球更靠近太阳。理解最大延伸可以增强我们对天文事件和我们太阳系动态的欣赏。当我们观察夜空时，常常会注意到在星星中脱颖而出的明亮物体。这些物体可以是行星，它们的可见性受到相对于太阳和地球的位置影响。一颗行星的最大延伸发生在它在天空中看起来与太阳最远时，这使得用肉眼更容易看到。例如，在水星的最大延伸期间，它可以在傍晚或清晨的天空中被看到，具体取决于它位于太阳的东侧还是西侧。最大延伸的时机因行星而异。水星大约每116天经历一次这种事件，而金星的周期则较长，大约为584天。这种周期性是由于行星的轨道速度不同。通过跟踪这些延伸，天文学家可以预测行星在何时最为可见，并相应地计划观察。最大延伸的重要性不仅仅体现在可见性上。它还提供了对行星轨道力学的深入见解。当一颗行星达到其最大延伸时，通常处于其轨道上的一个引力平衡点。这种平衡使天文学家能够研究行星的运动，更准确地理解其轨迹。此外，行星的最大延伸也可能影响它们的亮度。当一颗行星位于离太阳最远的位置时，它反射更多的阳光，使其在夜空中显得更亮。这种亮度在不同的延伸之间可能会有显著变化，这就是为什么有些晚上我们可能会发现某些行星特别耀眼。除了科学重要性外，最大延伸还有文化和历史意义。在历史上，各种文明观察行星的运动并将其纳入他们的日历和神话中。古代天文学家会注意到行星在其最大延伸期间的可见性，从而影响农业实践和宗教仪式。总之，术语最大延伸概括了行星观察的一个重要方面。它描述了一颗行星在天空中与太阳最远的时刻，允许最佳的可见性和研究。通过理解这一概念，我们不仅增强了对天文学的知识，还与人类观察宇宙的丰富历史联系在一起。当我们仰望夜空，下次看到一颗明亮的行星闪耀时，我们可能正目睹着它的最大延伸。