exmeridian altitude

简明释义

近中天高度

英英释义

例句

1.The sailor noted the exmeridian altitude of the North Star to fix their position.

水手记录了北极星的出子午线高度以确定他们的位置。

2.Using a sextant, the crew measured the exmeridian altitude of the sun at noon.

船员们使用六分仪在中午测量太阳的出子午线高度。

3.In celestial navigation, knowing the exmeridian altitude is crucial for accurate readings.

在天文导航中，了解出子午线高度对准确读数至关重要。

4.The exmeridian altitude helps in calculating the local latitude during navigation.

出子午线高度有助于在航行中计算当地的纬度。

5.The navigator calculated the exmeridian altitude to determine the ship's position accurately.

导航员计算了出子午线高度以准确确定船只的位置。

作文

The concept of exmeridian altitude is an essential aspect of celestial navigation and astronomy. It refers to the altitude of a celestial body, such as the sun or a star, measured at a specific time when it is not at its highest point in the sky. This measurement is crucial for navigators and astronomers who rely on precise calculations to determine their position on Earth. Understanding exmeridian altitude allows individuals to make accurate adjustments to their navigational methods, ensuring they can find their way even in challenging conditions.In celestial navigation, sailors have historically used the stars and the sun to guide their journeys across vast oceans. The exmeridian altitude provides valuable information about the position of these celestial bodies at various times of the day. By measuring the altitude of a star or the sun at a specific moment, navigators can calculate their latitude and longitude, which are critical for determining their exact location.Astronomers also utilize the concept of exmeridian altitude when observing celestial events. For instance, when studying the movements of planets or the phases of the moon, knowing the altitude of these objects at different times helps astronomers create more accurate models of their trajectories. This understanding is vital for predicting eclipses, transits, and other astronomical phenomena.One practical application of exmeridian altitude is during the process of sight reduction, where navigators convert celestial observations into usable data for navigation. By taking multiple readings of a celestial body’s altitude at various times, they can establish a more comprehensive understanding of their position. The exmeridian altitude plays a key role in this process, as it helps to refine the calculations needed to pinpoint one’s location accurately.To illustrate the importance of exmeridian altitude, consider a sailor attempting to cross the Pacific Ocean. If they take a sighting of the sun at noon, when it is at its highest point (the meridian), they will obtain what is known as the meridian altitude. However, if they take another sighting of the sun later in the day, the altitude will be lower, and this is referred to as the exmeridian altitude. By comparing both measurements, the sailor can better understand their current position relative to where they were at noon, allowing them to adjust their course accordingly.In conclusion, the term exmeridian altitude encapsulates a fundamental principle in the fields of navigation and astronomy. It signifies the altitude of a celestial body at any given time outside of its highest point in the sky. Mastery of this concept is vital for those who navigate by the stars or study celestial mechanics, as it enhances their ability to make informed decisions based on precise measurements. Whether on a ship navigating through open waters or in an observatory tracking the movements of distant planets, understanding exmeridian altitude is crucial for achieving accuracy and success in their endeavors.

“外子午线高度”这一概念是天文导航和天文学的一个重要方面。它指的是在特定时间测量的天体（如太阳或星星）的高度，而不是在天空中最高点时的高度。这一测量对于依赖精确计算来确定自己在地球上位置的导航员和天文学家至关重要。理解“外子午线高度”使得个人能够对其导航方法进行准确调整，确保他们即使在困难条件下也能找到自己的方向。在天文导航中，水手们历史上一直使用星星和太阳来指导他们穿越广阔的海洋。“外子午线高度”提供了关于这些天体在一天中的不同时间位置的宝贵信息。通过测量特定时刻星星或太阳的高度，导航员可以计算出他们的纬度和经度，这对于确定他们的确切位置至关重要。天文学家在观察天文事件时也利用“外子午线高度”的概念。例如，在研究行星的运动或月相时，了解这些物体在不同时间的高度有助于天文学家创建更准确的轨迹模型。这种理解对于预测日食、凌日和其他天文现象至关重要。“外子午线高度”的一个实际应用是在视差还原过程中，导航员将天体观察结果转换为可用于导航的数据。通过在不同时间对天体的高度进行多次读数，他们可以建立对自身位置的更全面理解。“外子午线高度”在这一过程中发挥着关键作用，因为它有助于完善所需的计算，以准确定位。为了说明“外子午线高度”的重要性，考虑一位试图横渡太平洋的水手。如果他们在正午（天体在其最高点，即子午线时）测量太阳的高度，他们将获得所谓的子午线高度。然而，如果他们在一天晚些时候再测量太阳的高度，结果会更低，这被称为“外子午线高度”。通过比较这两项测量，水手可以更好地理解他们当前的位置与正午时的相对位置，从而相应调整航向。总之，“外子午线高度”这一术语概括了导航和天文学领域的一个基本原则。它表示在天空中任何给定时间内天体的高度，且该时间不在其最高点。掌握这一概念对于那些依靠星星导航或研究天体力学的人来说至关重要，因为它增强了他们根据精确测量做出明智决策的能力。无论是在开放水域航行的船上，还是在天文台追踪遥远行星的运动，理解“外子午线高度”对于在他们的努力中实现准确性和成功至关重要。