hour angle

简明释义

时角

英英释义

例句

1.The astronomer calculated the hour angle 时角 to determine the position of the star in the night sky.

天文学家计算了时角 hour angle以确定星星在夜空中的位置。

2.To calculate the hour angle 时角, you need to know the local sidereal time.

要计算时角 hour angle，你需要知道当地的恒星时间。

3.The hour angle 时角 affects the apparent motion of celestial bodies.

在天体的表观运动中，时角 hour angle起着重要作用。

4.The hour angle 时角 is crucial for accurate solar panel alignment.

对于准确的太阳能电池板对齐，时角 hour angle是至关重要的。

5.By measuring the hour angle 时角, sailors can find their longitude at sea.

通过测量时角 hour angle，水手可以找到他们在海上的经度。

作文

The concept of hour angle is essential in the fields of astronomy and navigation. To understand this term, we must first recognize its components. The hour angle represents the measure of time since solar noon, expressed in angular measurement (degrees). Specifically, it indicates how far the sun has moved across the sky from its highest point at noon. Each hour corresponds to 15 degrees of the celestial sphere, as the Earth rotates 360 degrees in approximately 24 hours. Thus, when we talk about the hour angle, we are essentially discussing the position of the sun relative to an observer on Earth.For instance, if it is 3 PM, the hour angle would be 45 degrees, indicating that the sun has moved 45 degrees west of the noon meridian. This concept not only helps astronomers track the sun's position but also aids in determining the time of day based on the sun's location in the sky. In practical applications, the hour angle is crucial for solar energy systems, where understanding the sun's trajectory allows for optimal placement of solar panels. By calculating the hour angle, engineers can maximize the exposure of solar panels to sunlight throughout the day, thereby increasing energy efficiency.Moreover, the hour angle is also significant in the context of celestial navigation. Sailors and aviators rely on this measurement to determine their position relative to the stars and the sun. By knowing the hour angle, navigators can calculate their local solar time, which is vital for accurate positioning on the globe.In summary, the hour angle is a fundamental concept that bridges time and space. It plays a pivotal role in various scientific fields, including astronomy, solar energy, and navigation. Understanding the hour angle enables us to appreciate the intricate relationship between the Earth and the sun, as well as the importance of timekeeping in our daily lives. As we continue to explore these concepts, we gain deeper insights into the mechanics of our universe and our place within it.

‘小时角’（hour angle）这个概念在天文学和导航领域中至关重要。要理解这个术语，我们首先必须认识到它的组成部分。小时角表示自太阳正午以来的时间度量，以角度测量（度）表示。具体来说，它指示太阳从正午的最高点在天空中移动的距离。每小时对应于天球上的15度，因为地球在大约24小时内旋转360度。因此，当我们谈论‘小时角’（hour angle）时，我们实际上是在讨论太阳相对于地球上观察者的位置。例如，如果现在是下午3点，那么小时角将是45度，表示太阳已经从正午子午线向西移动了45度。这个概念不仅帮助天文学家追踪太阳的位置，还帮助人们根据太阳在天空中的位置确定时间。在实际应用中，‘小时角’（hour angle）对太阳能系统至关重要，了解太阳的轨迹可以优化太阳能电池板的放置。通过计算小时角，工程师可以最大限度地提高太阳能电池板在一天内接受阳光的暴露，从而提高能源效率。此外，‘小时角’（hour angle）在天体导航中也具有重要意义。水手和飞行员依赖这一测量来确定他们相对于星星和太阳的位置。通过知道小时角，导航员可以计算出他们的当地太阳时间，这对在地球上进行准确定位至关重要。总之，‘小时角’（hour angle）是一个基本概念，将时间和空间联系在一起。它在天文学、太阳能和导航等多个科学领域中发挥着关键作用。理解小时角使我们能够欣赏地球与太阳之间复杂的关系，以及时间计量在我们日常生活中的重要性。随着我们继续探索这些概念，我们将对宇宙的机制及我们在其中的位置有更深入的了解。