place hour angle

简明释义

地方时角

英英释义

例句

1.The telescope's settings require you to place hour angle 时角 for accurate tracking of stars.

望远镜的设置要求你place hour angle 时角以准确跟踪星星。

2.To calculate the position of the sun at noon, we need to place hour angle 时角 correctly.

为了计算正午时太阳的位置，我们需要正确地place hour angle 时角。

3.When using a sundial, you must place hour angle 时角 according to the local time.

使用日晷时，必须根据当地时间place hour angle 时角。

4.Astronomers often place hour angle 时角 in their calculations to determine celestial positions.

天文学家常常在他们的计算中place hour angle 时角以确定天体位置。

5.In navigation, sailors place hour angle 时角 to find their longitude.

在航海中，水手们place hour angle 时角来找到他们的经度。

作文

The concept of the place hour angle is essential in the field of astronomy and navigation. It refers to the angular measurement of time, which represents the position of a celestial body in relation to an observer's local meridian. Understanding this concept not only aids in accurately determining the time but also helps in navigating the stars. The place hour angle is typically expressed in degrees, where one complete rotation of the Earth corresponds to 360 degrees over a 24-hour period, translating to 15 degrees per hour. To grasp the importance of the place hour angle, one must first understand how it relates to the celestial sphere. The celestial sphere is an imaginary sphere that encompasses the Earth, with stars and other celestial bodies projected onto its surface. As the Earth rotates, different celestial bodies rise and set, creating a dynamic sky that changes throughout the night. The place hour angle provides a way to quantify the position of these celestial objects at any given time. When observing a star, the place hour angle can be calculated by measuring the angle between the star and the local meridian, which is an imaginary line running from the North Pole to the South Pole, passing directly overhead. This measurement enables astronomers and navigators to determine precisely when a star will be visible in the sky and when it will set. For instance, if a star has a place hour angle of 90 degrees, it means that the star is positioned directly east of the observer's location, while an angle of 270 degrees indicates that the star is directly west. In addition to its practical applications, the place hour angle also has significant implications for understanding timekeeping. Historically, sailors relied on the position of celestial bodies to determine their longitude at sea. By knowing the place hour angle of a known star at a specific time, they could calculate their position relative to the Greenwich Mean Time (GMT). This method of navigation was crucial before the invention of modern GPS technology, showcasing the enduring relevance of the place hour angle in maritime history. Moreover, the place hour angle plays a vital role in the field of astrophysics. Researchers use it to track the motion of celestial bodies and predict their future positions. This information is crucial for various scientific endeavors, including the study of exoplanets, the tracking of asteroids, and even planning space missions. For example, when launching a satellite, engineers must account for the place hour angle of both the satellite and the Earth to ensure successful deployment. In conclusion, the place hour angle is a fundamental concept in astronomy and navigation that serves multiple purposes, from aiding in timekeeping to enhancing our understanding of the universe. By measuring the angular distance of celestial bodies relative to the local meridian, we can navigate, observe, and explore the cosmos with greater precision. As we continue to advance in our understanding of the universe, the significance of the place hour angle will undoubtedly remain a cornerstone of astronomical study and navigation.

“位置时角”这一概念在天文学和导航领域至关重要。它指的是时间的角度测量，表示一个天体相对于观察者本地子午线的位置。理解这一概念不仅有助于准确确定时间，还有助于在星空中导航。“位置时角”通常以度数表示，其中地球的完整旋转对应于360度，跨越24小时的时间，换算为每小时15度。要理解“位置时角”的重要性，首先必须了解它与天球的关系。天球是一个想象中的球体，包围着地球，星星和其他天体投影到其表面。随着地球的自转，不同的天体升起和落下，创造出一个动态的天空，在夜晚不断变化。“位置时角”提供了一种量化这些天体在任何给定时间位置的方法。在观察一颗星星时，可以通过测量星星与当地子午线之间的角度来计算“位置时角”，这个子午线是从北极到南极的想象线，正好经过观察者的头顶。这一测量使天文学家和导航员能够精确确定一颗星星在天空中何时可见以及何时落下。例如，如果一颗星星的“位置时角”为90度，则意味着该星星位于观察者位置的正东方，而270度的角度则表示该星星位于正西方。除了实际应用外，“位置时角”在时间计量的理解上也具有重大意义。在历史上，水手依靠天体的位置来确定他们在海上的经度。通过知道一个已知星星在特定时间的“位置时角”，他们可以计算出自己相对于格林威治标准时间（GMT）的位置。这种导航方法在现代GPS技术发明之前至关重要，展示了“位置时角”在海洋历史中的持久相关性。此外，“位置时角”在天体物理学领域也发挥着重要作用。研究人员利用它来追踪天体的运动并预测它们的未来位置。这些信息对各种科学工作至关重要，包括外行星的研究、小行星的追踪，甚至是太空任务的规划。例如，在发射卫星时，工程师必须考虑卫星和地球的“位置时角”，以确保成功部署。总之，“位置时角”是天文学和导航中的一个基本概念，具有多重用途，从帮助时间计量到增强我们对宇宙的理解。通过测量天体相对于当地子午线的角距离，我们可以更精确地导航、观察和探索宇宙。随着我们对宇宙理解的不断深入，“位置时角”的重要性无疑将继续成为天文学研究和导航的基石。