vernier sextant

简明释义

游标式六分仪

英英释义

例句

1.A vernier sextant is essential for accurate navigation in open waters.

游标六分仪对于在开阔水域中的精确导航至关重要。

2.Using a vernier sextant requires practice and precision.

使用游标六分仪需要练习和精确度。

3.The vernier sextant helped the sailors navigate through foggy conditions.

游标六分仪帮助水手们在雾霭中导航。

4.He calibrated the vernier sextant before taking his measurements.

在进行测量之前，他对游标六分仪进行了校准。

5.The captain used the vernier sextant to determine the ship's position at sea.

船长使用游标六分仪来确定船只在海上的位置。

作文

The world of navigation has evolved significantly over the centuries, but certain tools have remained crucial for accurate positioning and measurement. One such tool is the vernier sextant, a sophisticated instrument used primarily in maritime navigation. This device allows sailors and navigators to determine their latitude and longitude by measuring the angles between celestial bodies and the horizon. Understanding the vernier sextant is essential for anyone interested in navigation, astronomy, or the history of exploration.A vernier sextant consists of a curved arm called an index arm, which rotates around a pivot point. At the end of this arm is a telescope that helps the navigator sight distant celestial bodies, such as stars, planets, and the sun. The key feature of the vernier sextant is its vernier scale, which enhances the precision of angle measurements. The vernier scale allows users to read angles to a much finer degree than the main scale alone would permit. This increased accuracy is vital when navigating vast oceans where even a small error can lead to significant deviations from the intended course.To use a vernier sextant, a navigator first aligns the instrument with the horizon. They then adjust the index arm until the image of the celestial body they are observing is superimposed on the horizon line seen through the telescope. This process requires careful attention and skill, as any misalignment can result in incorrect readings. Once aligned, the navigator reads the angle from the main scale and uses the vernier scale to obtain a more precise measurement. The combination of these readings gives the navigator the exact angle needed to calculate their position.The importance of the vernier sextant cannot be overstated. Before the advent of modern GPS technology, navigators relied heavily on this instrument to traverse the world's oceans. It played a pivotal role in the Age of Exploration, allowing explorers to chart new territories and establish trade routes. The ability to measure angles accurately meant that ships could navigate safely and efficiently, reducing the risks associated with long sea voyages.Despite advancements in technology, the principles behind the vernier sextant remain relevant today. Many mariners still carry this instrument as a backup to electronic navigation systems. In addition, the vernier sextant is often used in educational settings to teach students about celestial navigation and the fundamentals of geometry and trigonometry. Learning to use a vernier sextant provides valuable insights into the relationship between mathematics and navigation, highlighting the importance of precise measurements in various fields.In conclusion, the vernier sextant is more than just a historical artifact; it is a testament to human ingenuity and the quest for exploration. Its design and functionality have stood the test of time, making it an enduring symbol of navigation. By understanding the vernier sextant, we not only appreciate the art of navigation but also gain insight into the scientific principles that have guided humanity across the seas for centuries.

导航的世界在几个世纪中经历了重大变化，但某些工具仍然对准确定位和测量至关重要。其中一个工具是游标海角仪，这是一种主要用于海洋导航的复杂仪器。该设备使水手和导航员能够通过测量天体与地平线之间的角度来确定他们的纬度和经度。理解游标海角仪对于任何对导航、天文学或探索历史感兴趣的人来说都是必不可少的。游标海角仪由一个称为指示臂的弯曲臂组成，该臂围绕一个支点旋转。在这个臂的末端有一个望远镜，帮助导航员瞄准遥远的天体，如星星、行星和太阳。游标海角仪的关键特征是其游标尺，它增强了角度测量的精确性。游标尺允许用户读取比主尺单独提供的更精细的角度。这种增加的准确性在广阔的海洋导航中至关重要，因为即使是微小的误差也可能导致航向的重大偏差。使用游标海角仪时，导航员首先将仪器与地平线对齐。然后，他们调整指示臂，直到通过望远镜观察到的天体图像与地平线重叠。这个过程需要仔细的关注和技巧，因为任何不对齐都可能导致读数不正确。一旦对齐，导航员就可以从主尺上读取角度，并使用游标尺获得更精确的测量值。这些读数的组合为导航员提供了计算位置所需的确切角度。游标海角仪的重要性不容小觑。在现代GPS技术出现之前，导航员在横渡世界海洋时严重依赖这一工具。它在探索时代发挥了关键作用，使探险家能够绘制新领土并建立贸易路线。准确测量角度的能力意味着船只可以安全高效地航行，减少长途海上航行相关的风险。尽管技术有所进步，但游标海角仪背后的原理至今仍然适用。许多水手仍然将这种仪器作为电子导航系统的备份。此外，游标海角仪通常在教育环境中使用，以教学生有关天文导航以及几何和三角学的基础知识。学习使用游标海角仪提供了对数学与导航之间关系的宝贵见解，突显了精确测量在各个领域的重要性。总之，游标海角仪不仅仅是一个历史遗物；它是人类聪明才智和探索追求的见证。它的设计和功能经受住了时间的考验，使其成为导航的持久象征。通过理解游标海角仪，我们不仅欣赏导航的艺术，还深入了解几个世纪以来引导人类穿越海洋的科学原理。