astronomical meridian

简明释义

天球子午线

英英释义

例句

1.The observatory's telescope is aligned with the astronomical meridian to ensure accurate star tracking.

天文台的望远镜与天文子午线对齐，以确保准确追踪星星。

2.During the equinox, the sun crosses the astronomical meridian at noon, marking a significant point in the celestial calendar.

在春分时，太阳在中午穿过天文子午线，标志着天文日历中的一个重要时刻。

3.The astronomical meridian plays a crucial role in celestial navigation and timekeeping.

天文子午线在天文导航和计时中起着至关重要的作用。

4.To calculate the time accurately, astronomers must know the position of the astronomical meridian relative to their location.

为了准确计算时间，天文学家必须知道天文子午线相对于他们位置的方位。

5.Navigators use the astronomical meridian to determine their longitude while at sea.

航海者利用天文子午线来确定他们在海上的经度。

作文

The concept of the astronomical meridian is fundamental in the field of astronomy and navigation. An astronomical meridian is defined as a great circle on the celestial sphere that passes through the zenith point of an observer and extends to the north and south celestial poles. This line is crucial for determining local time and for mapping the positions of celestial objects in the sky. Understanding the astronomical meridian allows astronomers and navigators to accurately position themselves relative to the stars and other celestial bodies.In ancient times, people relied heavily on the stars for navigation. They would use the astronomical meridian as a reference point to chart their courses across vast oceans. By knowing the position of the sun and stars at different times of the day, sailors could determine their latitude and longitude. The astronomical meridian thus served as a vital tool for safe passage and exploration.As technology advanced, the importance of the astronomical meridian did not diminish. In modern astronomy, it plays a key role in the establishment of local sidereal time, which is essential for telescopic observations. Knowing when a celestial object will cross the astronomical meridian helps astronomers plan their observations and optimize the use of telescopes. This precision is especially important when dealing with distant galaxies or transient astronomical events, such as supernovae.Furthermore, the astronomical meridian is also significant in the context of global positioning systems (GPS). GPS technology relies on a network of satellites that orbit the Earth, each equipped with atomic clocks. These satellites communicate their positions to receivers on the ground, allowing users to determine their exact location. The calculations performed by GPS systems often involve the astronomical meridian to ensure accurate positioning. Without this understanding, the system would not be able to provide the precise coordinates that users depend on for navigation.In conclusion, the astronomical meridian is more than just a theoretical concept; it has practical applications that have evolved over centuries. From ancient mariners using the stars to navigate the seas to modern astronomers and GPS technology, the astronomical meridian remains a cornerstone of our understanding of the cosmos and our place within it. As we continue to explore the universe, the significance of the astronomical meridian will undoubtedly endure, guiding us through the complexities of space and time.

天文学子午线的概念在天文学和导航领域中是基础性的。天文学子午线被定义为一个在天球上经过观察者的天顶点并延伸到南北天极的伟大圆圈。这条线对于确定当地时间以及绘制天体在天空中的位置至关重要。理解天文学子午线使天文学家和导航员能够准确地相对于星星和其他天体定位。在古代，人们在导航时非常依赖星星。他们会使用天文学子午线作为参考点，在辽阔的海洋上绘制航线。通过了解太阳和星星在一天不同时间的位置，水手可以确定他们的纬度和经度。因此，天文学子午线成为安全通行和探索的重要工具。随着技术的进步，天文学子午线的重要性并没有减弱。在现代天文学中，它在当地恒星时的建立中发挥着关键作用，这对于望远镜观测至关重要。知道一个天体何时会穿过天文学子午线有助于天文学家规划他们的观测并优化望远镜的使用。这种精确性在处理遥远的星系或瞬态天文事件（如超新星）时尤为重要。此外，天文学子午线在全球定位系统（GPS）的背景下也具有重要意义。GPS技术依赖于一组绕地球轨道运行的卫星，每个卫星都配备了原子钟。这些卫星与地面接收器通信，使用户能够确定其确切位置。GPS系统执行的计算通常涉及天文学子午线以确保准确定位。如果没有这种理解，该系统将无法提供用户在导航中所依赖的精确坐标。总之，天文学子午线不仅仅是一个理论概念；它具有跨越几个世纪演变而来的实际应用。从古代水手使用星星在海洋上导航，到现代天文学家和GPS技术，天文学子午线仍然是我们理解宇宙及其在其中位置的基石。随着我们继续探索宇宙，天文学子午线的重要性无疑将持续存在，引导我们穿越空间和时间的复杂性。