correction of ex-meridian altitude

简明释义

近中天高度改正量

英英释义

例句

1.In celestial navigation, the correction of ex-meridian altitude is crucial for determining the observer's latitude.

在天文导航中，经线外高度修正对确定观察者的纬度至关重要。

2.During the training session, we learned how to apply the correction of ex-meridian altitude in various scenarios.

在培训课程中，我们学习了如何在各种情况下应用经线外高度修正。

3.The navigator applied the correction of ex-meridian altitude to ensure accurate positioning during the voyage.

导航员应用了经线外高度修正以确保航行中的准确定位。

4.The correction of ex-meridian altitude can significantly affect the results of a navigation fix if not applied properly.

如果没有正确应用，经线外高度修正会显著影响导航定位的结果。

5.After calculating the sun's altitude, the sailor made the correction of ex-meridian altitude to find their exact location.

在计算太阳高度后，水手进行了经线外高度修正以找到他们的确切位置。

作文

Navigating the vast oceans and skies has always been a challenge for explorers and navigators alike. One of the fundamental aspects of navigation is understanding celestial bodies, particularly the sun and stars. As navigators rely on these celestial references to determine their position, they often encounter the concept of altitude. In this context, the term correction of ex-meridian altitude refers to the adjustments made to the altitude of a celestial body when it is not observed at its highest point in the sky, known as the meridian. This correction is crucial for accurate positioning and is an essential skill for anyone involved in navigation.The process of determining one’s location using celestial navigation involves measuring the angle between the horizon and a celestial body, such as the sun or a star. When this measurement is taken, it is referred to as the altitude of that body. However, if this measurement is not taken at the moment the celestial body is at its highest point, navigators must apply the correction of ex-meridian altitude to ensure accuracy. This correction accounts for the time difference between the observation and the meridian passage, allowing navigators to adjust their readings accordingly.To understand why this correction is necessary, we must consider the movement of celestial bodies across the sky. The sun and stars rise in the east and set in the west, following an arc that reaches its peak at local noon. At this peak, the altitude measurement is most reliable because it represents the body’s highest position relative to the observer's horizon. If a navigator takes an altitude measurement before or after this peak, the reading will be lower than the true altitude, leading to potential errors in navigation.The correction of ex-meridian altitude involves calculating the difference between the observed altitude and the true altitude at meridian passage. This calculation is based on the time of the observation relative to the local noon and the geographical location of the observer. Various tables and formulas are used to facilitate this correction, ensuring that navigators can accurately determine their latitude and, subsequently, their position on the globe.In practical terms, the importance of the correction of ex-meridian altitude cannot be overstated. For maritime navigators, even a small error in altitude can lead to significant deviations from the intended course, potentially resulting in dangerous situations at sea. Similarly, aviators who rely on celestial navigation must also account for this correction to maintain safe and accurate flight paths.In conclusion, the correction of ex-meridian altitude is a vital aspect of celestial navigation that ensures accuracy in determining one's position when observing celestial bodies. By understanding and applying this correction, navigators can significantly reduce errors and enhance their ability to traverse the vast expanses of our planet. Mastery of this concept is not just a technical skill; it is a testament to the intricate relationship between humanity and the cosmos, highlighting our enduring quest for exploration and understanding of the world around us.

在广袤的海洋和天空中航行一直是探险家和导航员面临的挑战之一。导航的基本方面之一是理解天体，特别是太阳和星星。由于导航员依赖这些天体作为确定其位置的参考，他们经常遇到高度这一概念。在这个背景下，术语ex-meridian高度的修正指的是对天体高度的调整，当天体未在其最高点，即子午线时被观测到。这一修正对于准确定位至关重要，是任何参与导航人员必备的技能。使用天文导航确定位置的过程涉及测量地平线与天体之间的角度，例如太阳或星星。当进行这种测量时，它被称为该天体的高度。然而，如果此测量不是在天体达到其最高点的时刻进行，导航员必须应用ex-meridian高度的修正以确保准确性。该修正考虑了观察与子午线通过之间的时间差，使导航员能够相应地调整他们的读数。要理解为什么这个修正是必要的，我们必须考虑天体在天空中的运动。太阳和星星从东方升起，向西方落下，遵循一个在当地中午达到顶峰的弧线。在这个顶峰时，高度测量最为可靠，因为它代表了天体相对于观察者地平线的最高位置。如果导航员在这个顶峰之前或之后进行高度测量，读数将低于真实高度，从而导致潜在的导航错误。ex-meridian高度的修正涉及计算观察到的高度与子午线通过时的真实高度之间的差异。此计算基于观察的时间与当地中午的关系以及观察者的地理位置。各种表格和公式用于便捷这一修正，确保导航员能够准确确定其纬度，并随后确定其在地球上的位置。在实际操作中，ex-meridian高度的修正的重要性不容小觑。对于海上导航员来说，即使是高度上的小错误也可能导致航向的重大偏差，可能导致海上的危险情况。同样，依赖天文导航的飞行员也必须考虑这一修正，以维持安全和准确的飞行路径。总之，ex-meridian高度的修正是天文导航中的一个重要方面，它确保在观察天体时准确确定位置。通过理解和应用这一修正，导航员可以显著减少错误，提高他们穿越我们星球辽阔空间的能力。掌握这一概念不仅是一项技术技能；它是人类与宇宙之间复杂关系的证明，突显了我们对探索和理解周围世界的持久追求。