ephemeris second

简明释义

星历秒

英英释义

例句

1.In astronomy, an ephemeris second is essential for determining the orbits of planets and their moons.

在天文学中，历元秒对于确定行星及其卫星的轨道至关重要。

2.Astrophysicists use the ephemeris second to analyze the movement of distant stars.

天体物理学家使用历元秒来分析遥远星星的运动。

3.GPS technology relies on the accurate timing provided by the ephemeris second to ensure precise location data.

GPS技术依赖于由历元秒提供的准确时间，以确保精确的位置数据。

4.The calculations for space missions often involve the ephemeris second to synchronize spacecraft instruments.

太空任务的计算通常涉及历元秒以同步航天器仪器。

5.The satellite's position is calculated using the ephemeris second, which refers to the precise time measurement for tracking celestial objects.

卫星的位置是通过使用历元秒来计算的，这指的是用于跟踪天体的精确时间测量。

作文

In the realm of astronomy and timekeeping, precision is of utmost importance. One term that often arises in discussions about time measurement is the ephemeris second. The ephemeris second is a unit of time that is defined based on the motion of celestial bodies, particularly in relation to their positions in space. It is a crucial concept for astronomers and navigators who rely on accurate time measurements to track the movements of planets, stars, and satellites.To understand the significance of the ephemeris second, we must first delve into how time is measured in general. Traditionally, a second is defined based on the vibrations of cesium atoms, which provide a highly accurate standard. However, the ephemeris second takes this a step further by linking time to the dynamics of celestial objects. This means that the ephemeris second is not just a fixed interval of time; it can vary slightly depending on the gravitational influences and motions of these celestial bodies.The International Astronomical Union (IAU) introduced the ephemeris second to address discrepancies that arose from using atomic time in astronomical calculations. For instance, the position of the Earth in its orbit around the Sun can affect how time is perceived from different vantage points in space. By employing the ephemeris second, astronomers can ensure that their calculations account for these variations, leading to more precise models of celestial mechanics.One practical application of the ephemeris second is in the field of satellite navigation. Global Positioning System (GPS) technology relies heavily on accurate timing to determine locations on Earth. Satellites equipped with atomic clocks send signals that are timestamped using the ephemeris second, allowing receivers to calculate their position based on the time it takes for the signals to reach them. Without the precision offered by the ephemeris second, GPS systems would be far less reliable, leading to significant errors in navigation.Moreover, the ephemeris second also plays a vital role in scientific research. Astrophysicists studying the motion of galaxies or the behavior of distant stars must make precise calculations regarding time. The ephemeris second provides a consistent framework for these calculations, ensuring that researchers can accurately model the dynamics of the universe.In conclusion, the ephemeris second is an essential unit of time measurement that connects our understanding of time with the movements of celestial bodies. Its introduction has greatly enhanced the accuracy of astronomical observations and navigational systems. As we continue to explore the cosmos and develop new technologies, the importance of the ephemeris second will only increase, highlighting the intricate relationship between time, space, and the universe itself.

在天文学和时间测量的领域，精确性至关重要。一个常常出现在有关时间测量讨论中的术语是星历秒。星历秒是一种基于天体运动的时间单位，特别是与它们在空间中的位置相关。对于依赖准确时间测量来跟踪行星、恒星和卫星运动的天文学家和导航员来说，这是一个至关重要的概念。要理解星历秒的重要性，我们必须首先深入了解一般时间是如何测量的。传统上，秒是基于铯原子的振动来定义的，这提供了一个高度准确的标准。然而，星历秒更进一步，通过将时间与天体的动态联系起来。这意味着星历秒不仅仅是一个固定的时间间隔；根据这些天体的引力影响和运动，它可能会略有不同。国际天文学联合会（IAU）引入了星历秒来解决使用原子时间进行天文计算时出现的差异。例如，地球围绕太阳的轨道位置可以影响从不同视角观察到的时间。通过采用星历秒，天文学家可以确保他们的计算考虑到这些变化，从而导致更精确的天体力学模型。星历秒的一个实际应用是在卫星导航领域。全球定位系统（GPS）技术在确定地球上的位置时严重依赖准确的时间。配备原子钟的卫星发送带有星历秒时间戳的信号，使接收器能够根据信号到达所需的时间来计算其位置。如果没有星历秒提供的精确性，GPS系统的可靠性将大大降低，导致导航中出现重大错误。此外，星历秒在科学研究中也发挥着至关重要的作用。研究星系运动或遥远恒星行为的天体物理学家必须对时间进行精确计算。星历秒提供了一种一致的计算框架，确保研究人员能够准确建模宇宙的动态。总之，星历秒是一种重要的时间测量单位，将我们对时间的理解与天体运动联系在一起。它的引入极大地提高了天文观测和导航系统的准确性。随着我们继续探索宇宙并开发新技术，星历秒的重要性只会增加，突显出时间、空间和宇宙之间复杂的关系。