sidereal hour angle

简明释义

恒星时角共轭赤经

英英释义

例句

1.During the lecture, the professor explained how to convert local time to sidereal hour angle 恒星时角 for astronomical calculations.

在讲座中，教授解释了如何将当地时间转换为sidereal hour angle 恒星时角以进行天文计算。

2.The telescope's tracking system adjusts based on the sidereal hour angle 恒星时角 of the observed object.

望远镜的追踪系统根据观察对象的sidereal hour angle 恒星时角进行调整。

3.Understanding the sidereal hour angle 恒星时角 is crucial for accurate celestial navigation.

理解sidereal hour angle 恒星时角对于准确的天文导航至关重要。

4.The astronomer calculated the sidereal hour angle 恒星时角 to determine the position of the stars in the night sky.

天文学家计算了sidereal hour angle 恒星时角以确定夜空中星星的位置。

5.Amateur astronomers often use apps that calculate the sidereal hour angle 恒星时角 for various celestial bodies.

业余天文学家常常使用应用程序来计算各种天体的sidereal hour angle 恒星时角。

作文

The universe is a vast expanse filled with wonders that have captivated humanity for centuries. Among the many concepts that astronomers and astrophysicists explore, the term sidereal hour angle stands out as a fundamental aspect of celestial navigation and timekeeping. To understand this concept, one must first grasp the relationship between time and the movement of celestial bodies. The sidereal hour angle is defined as the angle that represents the time since a particular celestial object has crossed the local meridian, measured in hours. This measurement is crucial for astronomers who need to track the positions of stars and planets in the night sky.In essence, the sidereal hour angle allows astronomers to determine how far a celestial body has moved from its highest point in the sky, known as culmination. This is particularly important when observing objects that are not stationary, such as planets that orbit the Sun at varying speeds. By calculating the sidereal hour angle, astronomers can predict when a celestial body will be visible in a specific location, thus aiding in the planning of observations and research.The concept of the sidereal hour angle is rooted in the idea of sidereal time, which is based on the Earth's rotation relative to distant stars rather than the Sun. A sidereal day is approximately 23 hours, 56 minutes, and 4 seconds long, which is slightly shorter than a solar day. This discrepancy arises because the Earth is also moving along its orbit around the Sun, causing the position of the Sun in the sky to change slightly each day. As a result, the sidereal hour angle provides a more accurate measure of time for astronomical purposes, as it accounts for these differences.In practical terms, astronomers use the sidereal hour angle in conjunction with other measurements, such as declination, to pinpoint the exact location of a celestial object in the sky. Declination is similar to latitude on Earth and indicates how far north or south an object is relative to the celestial equator. Together, the sidereal hour angle and declination form a coordinate system that allows astronomers to locate and track celestial bodies effectively.Moreover, the significance of the sidereal hour angle extends beyond mere observation. It plays a crucial role in navigation, particularly for those who venture into the open seas or remote areas where traditional navigation methods may falter. By understanding the positions of stars and their corresponding sidereal hour angles, navigators can determine their location and course more accurately.In conclusion, the sidereal hour angle is a vital concept in the field of astronomy and navigation. It serves as a bridge between time and the movements of celestial bodies, enabling astronomers to track their positions and predict their visibility. As we continue to explore the cosmos, the understanding of such concepts becomes increasingly essential, not only for scientific discovery but also for practical applications in our daily lives. The study of the sidereal hour angle exemplifies the intricate relationship between time, space, and our place in the universe, reminding us of the beauty and complexity of the world beyond our own.

宇宙是一个广阔的空间，充满了几个世纪以来吸引人类的奇迹。在天文学家和天体物理学家探索的众多概念中，术语恒星时角作为天体导航和计时的基本方面而脱颖而出。要理解这个概念，首先必须掌握时间与天体运动之间的关系。恒星时角被定义为自特定天体穿过当地子午线以来所经过的时间所代表的角度，以小时为单位测量。这个测量对需要追踪夜空中星星和行星位置的天文学家至关重要。从本质上讲，恒星时角使天文学家能够确定天体从其在天空中的最高点（称为极大值）移动的距离。这在观察不是静止的天体时尤为重要，例如以不同速度围绕太阳轨道运行的行星。通过计算恒星时角，天文学家可以预测特定地点何时会看到某个天体，从而有助于观察和研究的计划。恒星时角的概念源于基于地球相对于遥远恒星的自转的恒星时间。一个恒星日大约为23小时56分钟4秒，这比太阳日稍短。这种差异产生的原因是地球也在围绕太阳的轨道上移动，导致每天太阳在天空中的位置略有变化。因此，恒星时角为天文目的提供了更准确的时间测量，因为它考虑了这些差异。在实际应用中，天文学家将恒星时角与其他测量（如赤纬）结合使用，以精确定位天空中的天体。赤纬类似于地球上的纬度，指示一个物体相对于天球赤道的南北偏移。恒星时角和赤纬共同形成一个坐标系统，使天文学家能够有效地定位和追踪天体。此外，恒星时角的意义超越了单纯的观察。它在导航中发挥着至关重要的作用，特别是对于那些进入开放海域或偏远地区的人，在这些地方传统导航方法可能会失效。通过理解星星的位置及其对应的恒星时角，导航员可以更准确地确定他们的位置和航向。总之，恒星时角是天文学和导航领域的重要概念。它作为时间与天体运动之间的桥梁，使天文学家能够追踪它们的位置并预测它们的可见性。随着我们继续探索宇宙，对这些概念的理解变得越来越重要，不仅用于科学发现，也用于我们日常生活中的实际应用。对恒星时角的研究体现了时间、空间与我们在宇宙中的位置之间错综复杂的关系，提醒我们超越自身世界的美丽与复杂。