hour angle of heavenly body

简明释义

天体时角

英英释义

例句

1.The astronomer calculated the hour angle of heavenly body 天体的时角 to determine its position in the sky.

天文学家计算了天体的时角以确定其在天空中的位置。

2.Using a telescope, the observer noted the hour angle of heavenly body 天体的时角 to track its movement across the night sky.

使用望远镜，观察者记录了天体的时角以追踪其在夜空中的运动。

3.Understanding the hour angle of heavenly body 天体的时角 is crucial for accurate celestial navigation.

理解天体的时角对准确的天文导航至关重要。

4.The hour angle of heavenly body 天体的时角 changes as the Earth rotates, affecting star visibility.

随着地球的自转，天体的时角会发生变化，从而影响星星的可见性。

5.To find the local sidereal time, one must consider the hour angle of heavenly body 天体的时角 relative to Greenwich Mean Time.

要找到地方恒星时间，必须考虑与格林威治标准时间相关的天体的时角。

作文

The concept of the hour angle of heavenly body is fundamental in understanding celestial navigation and astronomy. The hour angle represents the measure of time since a celestial object last crossed the observer's meridian, expressed in angular measurement (degrees). Essentially, it allows astronomers and navigators to determine the position of stars and planets in the sky relative to a specific location on Earth. To grasp the significance of the hour angle of heavenly body, one must first understand the celestial sphere. This imaginary sphere surrounds the Earth, with celestial bodies projected onto its surface. The celestial equator divides this sphere into the northern and southern celestial hemispheres. The hour angle is measured from the observer's local noon, when the sun is at its highest point in the sky. As the Earth rotates, the hour angle changes, allowing us to track the movement of celestial bodies across the sky. For example, if a star is directly overhead at local noon, its hour angle is zero degrees. After one hour, the hour angle increases to 15 degrees, as the Earth has rotated 15 degrees in that time. This relationship between time and angle is crucial for navigation, especially before the advent of modern technology. Navigators relied heavily on the hour angle of heavenly body to determine their position at sea. By measuring the altitude of a star above the horizon and knowing its hour angle, they could calculate their latitude and longitude. This method was essential for safe passage across vast oceans, where landmarks were scarce. In modern astronomy, the hour angle of heavenly body continues to play a vital role. Telescopes are often equipped with tracking systems that adjust based on the hour angle, ensuring that celestial objects remain in view as they move across the sky. Additionally, understanding the hour angle is crucial for astrophotography, where precise alignment with celestial objects is necessary for capturing clear images. Moreover, the hour angle of heavenly body is not only applicable to stars but also to planets and other celestial phenomena. Each heavenly body has its own unique hour angle, which can change depending on the observer's location and the time of year. This variability adds complexity to astronomical calculations but also enhances our understanding of the dynamic nature of the universe. In conclusion, the hour angle of heavenly body is a key concept in both navigation and astronomy. It provides a framework for understanding the movement of celestial bodies and aids in determining positions on Earth. As we continue to explore the cosmos, the importance of this concept remains ever relevant, bridging the gap between ancient navigational techniques and modern astronomical practices. By mastering the hour angle of heavenly body, we gain deeper insights into the workings of our universe and our place within it.

天体的时角概念在理解天文导航和天文学中是基础性的。时角表示自某天体最后穿过观察者子午线以来的时间度量，以角度测量（度）表示。它本质上允许天文学家和导航员确定星星和行星在天空中相对于地球特定位置的位置。要理解天体的时角的重要性，首先必须理解天球的概念。这个想象中的球体包围着地球，天体投影到其表面上。天球赤道将这个球体分为北半球和南半球。时角从观察者的地方正午开始测量，此时太阳位于天空的最高点。随着地球的旋转，时角发生变化，使我们能够跟踪天体在天空中的运动。例如，如果一颗星星在地方正午时正好在头顶上，则其时角为零度。一个小时后，时角增加到15度，因为在这段时间内地球旋转了15度。这种时间与角度之间的关系对导航至关重要，尤其是在现代技术出现之前。导航员在海上定位时非常依赖天体的时角。通过测量星星在地平线上方的高度，并知道其时角，他们可以计算出自己的纬度和经度。这种方法对于安全穿越辽阔的海洋至关重要，因为那里缺乏地标。在现代天文学中，天体的时角仍然发挥着重要作用。望远镜通常配备有跟踪系统，根据时角进行调整，确保天体在移动时保持在视野中。此外，理解时角对于天文摄影也至关重要，因为精确对准天体对于捕捉清晰图像是必要的。此外，天体的时角不仅适用于恒星，还适用于行星和其他天体现象。每个天体都有其独特的时角，这可能会根据观察者的位置和季节的变化而变化。这种可变性增加了天文计算的复杂性，但也增强了我们对宇宙动态性质的理解。总之，天体的时角是导航和天文学的关键概念。它提供了理解天体运动的框架，并帮助确定地球上的位置。随着我们继续探索宇宙，这一概念的重要性依然相关，架起了古代导航技术与现代天文学实践之间的桥梁。通过掌握天体的时角，我们可以更深入地了解宇宙的运作及我们在其中的位置。