sidereal hour angle

简明释义

赤经共轭量

英英释义

例句

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

观察者计算了恒星时角 恒星时角以确定夜空中星星的位置。

2.Astronomers often use the sidereal hour angle 恒星时角 in their calculations to track the movement of planets.

天文学家在计算行星运动时经常使用恒星时角 恒星时角。

3.To find the right time for stargazing, one must account for the sidereal hour angle 恒星时角 of major celestial bodies.

为了找到合适的观星时间，必须考虑主要天体的恒星时角 恒星时角。

4.Understanding the sidereal hour angle 恒星时角 is crucial for amateur astronomers who want to map the night sky.

理解恒星时角 恒星时角对想要绘制夜空的业余天文学家至关重要。

5.The sidereal hour angle 恒星时角 helps in determining when a specific star will be visible from a given location.

通过恒星时角 恒星时角可以帮助确定某颗特定星星何时会在给定位置可见。

作文

The concept of sidereal hour angle is fundamental in the field of astronomy, particularly when it comes to understanding celestial coordinates and the movement of stars across the night sky. To grasp this term, we must first comprehend its components: 'sidereal' refers to the stars, while 'hour angle' pertains to the time since a celestial object last crossed the observer's meridian, expressed in angular measurement. Essentially, the sidereal hour angle indicates how far a star has moved from its highest point in the sky as seen from a specific location on Earth.In practical terms, the sidereal hour angle is measured in degrees, with one complete rotation of the Earth corresponding to 360 degrees. This means that every hour, the Earth rotates approximately 15 degrees. Therefore, if a star is directly overhead at midnight, after one hour, it will have moved 15 degrees westward in the sky, resulting in a sidereal hour angle of 15 degrees. After two hours, the angle increases to 30 degrees, and so forth. This relationship between time and angular measurement is crucial for astronomers as they chart the positions of celestial bodies.Understanding the sidereal hour angle is also essential for navigation and timekeeping. Historically, sailors relied on the positions of stars to navigate the seas, and knowing the sidereal hour angle of specific stars helped them determine their position relative to the Earth. In modern times, this concept is still relevant, especially in the fields of satellite positioning and astronomical observations. For instance, telescopes often need to be aligned based on the sidereal hour angle to accurately track celestial objects as they move across the sky.Furthermore, the sidereal hour angle plays a significant role in the calculation of the local sidereal time, which is crucial for astronomers. Local sidereal time is based on the position of the stars rather than the Sun, and it helps astronomers synchronize their observations. By knowing the sidereal hour angle of a star, astronomers can determine when that star will be visible in the night sky, allowing for precise planning of observations.In conclusion, the sidereal hour angle is a vital concept in astronomy that connects time with the movement of celestial objects. Its applications extend beyond mere observation; it is instrumental in navigation, timekeeping, and even modern technological advancements. As we continue to explore the universe, understanding terms like sidereal hour angle will enhance our ability to comprehend the intricate dance of stars and planets that grace our night sky.

“恒星时角”这一概念在天文学领域中至关重要，尤其是在理解天体坐标和星星在夜空中的运动时。要掌握这个术语，我们首先必须理解它的组成部分：“恒星”指的是星星，而“时角”则指自某个天体最后穿过观察者的子午线以来的时间，以角度测量表示。因此，恒星时角 表示一颗星星相对于从地球特定位置观察时最高点的移动距离。在实际应用中，恒星时角 以度为单位进行测量，地球的一次完整旋转对应于360度。这意味着每小时，地球大约旋转15度。因此，如果一颗星星在午夜时分正好位于头顶，那么经过一个小时后，它将在天空中向西移动15度，从而导致其恒星时角 为15度。经过两个小时，角度增加到30度，依此类推。这种时间与角度测量之间的关系对天文学家绘制天体位置至关重要。理解恒星时角 对于导航和计时也至关重要。历史上，水手依靠星星的位置来航行海洋，了解特定星星的恒星时角 帮助他们确定相对于地球的位置。在现代，这一概念仍然相关，特别是在卫星定位和天文观测领域。例如，望远镜通常需要根据恒星时角 进行对齐，以准确跟踪在天空中移动的天体。此外，恒星时角 在计算地方恒星时间方面也发挥着重要作用，这对天文学家至关重要。地方恒星时间是基于星星的位置而不是太阳，帮助天文学家同步他们的观测。通过知道一颗星星的恒星时角，天文学家可以确定那颗星星何时会在夜空中可见，从而允许精确规划观测。总之，恒星时角 是一个在天文学中至关重要的概念，将时间与天体运动联系起来。它的应用超越了单纯的观察；在导航、计时甚至现代科技进步中都起着重要作用。随着我们继续探索宇宙，理解像恒星时角 这样的术语将增强我们理解装点夜空的星星和行星之间复杂舞蹈的能力。