ephemeris day

简明释义

星历日(86

英英释义

例句

1.The satellite's position was calculated for the ephemeris day 历书日 to ensure accurate tracking.

卫星的位置是为历书日 ephemeris day 计算的，以确保准确跟踪。

2.For precise navigation, pilots rely on data from the ephemeris day 历书日 provided by GPS satellites.

为了精确导航，飞行员依赖于GPS卫星提供的历书日 ephemeris day 数据。

3.During the mission briefing, the team discussed the significance of the ephemeris day 历书日 in their planning.

在任务简报中，团队讨论了历书日 ephemeris day 在他们规划中的重要性。

4.Astronomers often refer to the ephemeris day 历书日 when predicting planetary alignments.

天文学家在预测行星排列时常常提到历书日 ephemeris day。

5.The calculations for the spacecraft's trajectory were based on the ephemeris day 历书日 information.

宇宙飞船轨道的计算是基于历书日 ephemeris day 信息进行的。

作文

The concept of an ephemeris day is crucial in the field of astronomy and navigation. An ephemeris day refers to a specific time unit that is used to describe the position of celestial bodies in relation to Earth. Unlike a standard calendar day, which is based on the Earth's rotation, an ephemeris day is defined by the mean motion of celestial objects. This distinction is essential for astronomers and navigators who rely on precise calculations for their observations and navigational tasks.In practical terms, an ephemeris day is approximately 86,400 seconds long, similar to a solar day; however, it is not always perfectly aligned with the rotation of the Earth. The discrepancies arise due to various factors, including gravitational influences from other celestial bodies and the irregularities in Earth's rotation. As a result, the use of ephemeris day allows for more accurate predictions and measurements in the astronomical community.For instance, when astronomers create ephemerides, which are tables listing the positions of celestial bodies at specific times, they utilize the concept of ephemeris day to ensure that their calculations are as precise as possible. These tables are invaluable for tracking the movements of planets, stars, and other celestial phenomena. Without the accurate framework provided by the ephemeris day, it would be challenging to predict events such as eclipses or the positions of planets in the night sky.Moreover, the ephemeris day plays a significant role in satellite technology and space exploration. Satellites orbiting Earth must account for the variance in time measurement to maintain their correct trajectories. Engineers and scientists must consider the ephemeris day when calculating launch windows and orbital paths to avoid potential collisions and ensure successful missions.In addition to its scientific applications, the ephemeris day also has cultural implications. Many ancient civilizations relied on celestial observations for agricultural practices, navigation, and religious events. Understanding the cycles of celestial bodies required a keen awareness of time, leading to the development of calendars that, while not identical to the modern concept of an ephemeris day, were influenced by the movements of the stars and planets.In conclusion, the term ephemeris day encapsulates a fundamental concept in astronomy that bridges the gap between time measurement and celestial observation. Its significance extends beyond science, influencing historical practices and modern technologies alike. As we continue to explore the universe, the importance of understanding and utilizing the ephemeris day will remain paramount for both current and future generations of astronomers, navigators, and space enthusiasts.

‘天文日’的概念在天文学和导航领域至关重要。‘天文日’指的是一个特定的时间单位，用于描述天体相对于地球的位置。与基于地球自转的标准日历日不同，‘天文日’是由天体的平均运动定义的。这一区别对依赖精确计算进行观测和导航任务的天文学家和导航员来说是至关重要的。在实际应用中，‘天文日’大约为86400秒，类似于太阳日；然而，它并不总是与地球的自转完美对齐。这些差异的产生是由于包括其他天体的引力影响和地球自转的不规则性等各种因素。因此，使用‘天文日’使天文学界能够进行更准确的预测和测量。例如，当天文学家创建天文历，即列出天体在特定时间位置的表格时，他们利用‘天文日’的概念以确保其计算尽可能精确。这些表格对于跟踪行星、恒星和其他天体现象是不可或缺的。如果没有‘天文日’提供的准确框架，预测诸如日食或行星在夜空中的位置等事件将变得困难。此外，‘天文日’在卫星技术和太空探索中也扮演着重要角色。绕地球运行的卫星必须考虑时间测量的变化，以维持其正确的轨迹。工程师和科学家在计算发射窗口和轨道路径时必须考虑‘天文日’，以避免潜在的碰撞并确保任务成功。除了科学应用外，‘天文日’还具有文化意义。许多古代文明依靠天体观测进行农业实践、导航和宗教活动。理解天体的周期需要对时间有敏锐的意识，导致日历的发展，虽然与现代‘天文日’的概念不完全相同，但受到星星和行星运动的影响。总之，‘天文日’这个术语概括了天文学中的一个基本概念，弥合了时间测量和天体观测之间的鸿沟。它的重要性超越了科学，影响着历史实践和现代技术。随着我们继续探索宇宙，理解和利用‘天文日’的重要性将对当前和未来的天文学家、导航员和太空爱好者保持至关重要。