sextant altitude

简明释义

六分仪高度

英英释义

例句

1.The navigator recorded the sextant altitude to determine their position at sea.

导航员记录了六分仪高度以确定他们在海上的位置。

2.To find the North Star, you need to measure its sextant altitude at night.

要找到北极星，你需要在晚上测量它的六分仪高度。

3.The captain explained how to use the sextant altitude in celestial navigation.

船长解释了如何在天文导航中使用六分仪高度。

4.By measuring the sextant altitude, sailors can calculate their latitude accurately.

通过测量六分仪高度，水手们可以准确计算他们的纬度。

5.Understanding sextant altitude is crucial for traditional navigation methods.

理解六分仪高度对于传统导航方法至关重要。

作文

The sextant is an essential instrument in navigation, particularly for sailors and aviators. It allows users to measure the angle between an astronomical object and the horizon. This measurement is crucial for determining one's position on the Earth. The term sextant altitude refers to the angle measured by the sextant when it is aligned with a celestial body, such as the sun or a star, and the horizon. Understanding sextant altitude is vital for accurate navigation, especially in open waters where landmarks are scarce. To effectively use a sextant, one must first understand how to take a proper reading of the sextant altitude. This process involves several steps. First, the navigator must ensure that the sextant is calibrated correctly. Any discrepancies in calibration can lead to significant errors in navigation. Once calibrated, the navigator points the sextant towards the celestial body they wish to observe. By adjusting the index arm, the navigator can bring the image of the celestial body down to the horizon line in the telescope view. When the celestial object is aligned with the horizon, the angle displayed on the sextant is recorded as the sextant altitude. The importance of accurately measuring sextant altitude cannot be overstated. For instance, if a sailor is navigating across the Atlantic Ocean, knowing their precise location is critical to avoid hazards and reach their destination safely. By taking regular readings of the sextant altitude at different times of the day, sailors can plot their course and make necessary adjustments based on their findings. Moreover, the sextant altitude can change throughout the day due to the movement of celestial bodies. For example, the sun rises and sets, changing its angle relative to the horizon. This variation means that navigators must be vigilant and take multiple readings to ensure accuracy. Additionally, factors such as atmospheric refraction can affect the measurement of sextant altitude, making it imperative for navigators to account for these variables when plotting their positions. In conclusion, the concept of sextant altitude plays a pivotal role in traditional navigation methods. While modern technology has introduced GPS and other advanced navigation systems, the fundamental principles of using a sextant remain relevant. Mastery of sextant altitude measurements not only enhances a navigator's skills but also deepens their appreciation for the art of celestial navigation. As we continue to explore the vast oceans and skies, understanding and utilizing tools like the sextant will always hold a place in the hearts of navigators around the world.

六分仪是导航中一种重要的仪器，尤其对于水手和飞行员来说。它允许用户测量天体与地平线之间的角度。这个测量对于确定自己在地球上的位置至关重要。术语sextant altitude指的是当六分仪与天体（如太阳或星星）和地平线对齐时所测得的角度。理解sextant altitude对于准确导航至关重要，特别是在地标稀少的开阔水域中。为了有效使用六分仪，首先必须了解如何正确读取sextant altitude。这个过程涉及几个步骤。首先，导航员必须确保六分仪校准正确。任何校准上的差异都可能导致导航中的重大错误。一旦校准完成，导航员就可以将六分仪指向他们希望观察的天体。通过调整指标臂，导航员可以将天体的图像带到望远镜视野中的地平线上。当天体与地平线对齐时，六分仪上显示的角度被记录为sextant altitude。准确测量sextant altitude的重要性不容小觑。例如，如果一名水手正在穿越大西洋，知道他们的确切位置对于避开危险和安全到达目的地至关重要。通过在一天中的不同时间定期读取sextant altitude，水手们可以绘制航线并根据发现进行必要的调整。此外，sextant altitude会随着天体的运动而变化。例如，太阳升起和落下，改变了其相对于地平线的角度。这种变化意味着导航员必须保持警惕，并进行多次读取以确保准确性。此外，气象折射等因素可能影响sextant altitude的测量，因此导航员在绘制位置时必须考虑这些变量。总之，sextant altitude的概念在传统导航方法中发挥着关键作用。虽然现代技术引入了GPS和其他先进的导航系统，但使用六分仪的基本原理仍然相关。掌握sextant altitude的测量不仅增强了导航员的技能，还加深了他们对天文导航艺术的欣赏。随着我们继续探索广阔的海洋和天空，理解和利用像六分仪这样的工具将始终在世界各地导航员的心中占有一席之地。