sextant adjustment

简明释义

六分仪校正

英英释义

例句

1.Before setting sail, the captain performed a sextant adjustment to ensure accurate navigation.

在出航之前，船长进行了六分仪调整以确保导航的准确性。

2.A small error in sextant adjustment can lead to significant navigational mistakes.

在六分仪调整中的小错误可能会导致重大的导航失误。

3.The navigator explained how to make a proper sextant adjustment for measuring the sun's altitude.

导航员解释了如何正确地进行六分仪调整以测量太阳的高度。

4.The old sailor shared his tips on sextant adjustment with the younger crew members.

老水手与年轻船员分享了他关于六分仪调整的技巧。

5.During the training session, we practiced sextant adjustment under various weather conditions.

在培训课程中，我们在各种天气条件下练习了六分仪调整。

作文

The sextant is a vital instrument in the field of navigation, widely used by sailors and aviators alike. One of the key aspects of effectively using a sextant is the process of sextant adjustment. This term refers to the calibration and fine-tuning of the sextant to ensure accurate readings when measuring angles between celestial bodies and the horizon. Without proper sextant adjustment, navigators may find themselves lost at sea, unable to determine their exact position. To understand the importance of sextant adjustment, we must first appreciate how a sextant functions. A sextant measures the angle between a celestial object, such as the sun or a star, and the horizon. This angle, known as altitude, is crucial for determining one’s latitude and longitude. However, various factors can affect the accuracy of these measurements, including temperature changes, mechanical wear, and even the curvature of the Earth. Therefore, regular sextant adjustment is necessary to maintain the instrument's precision.There are several steps involved in sextant adjustment. First, the navigator must ensure that the sextant is level. This is typically done using a bubble level attached to the instrument. If the sextant is not level, it will produce erroneous readings. Next, the index mirror must be aligned properly. The index mirror is a critical component that reflects the image of the celestial body being measured. If it is misaligned, the angle reading will be inaccurate. After ensuring that both the sextant is level and the index mirror is aligned, the navigator can proceed to check the zero error. Zero error occurs when the sextant does not read zero degrees when it should. This can happen due to manufacturing defects or wear over time. To correct this, the navigator will adjust the micrometer drum until the sextant reads zero when the two mirrors are aligned.In addition to these adjustments, environmental factors must also be considered. For instance, the temperature can cause the metal components of the sextant to expand or contract, which may affect its accuracy. Therefore, it is advisable to perform sextant adjustment in conditions similar to those expected during actual navigation. Furthermore, regular practice with the sextant is essential for any navigator. Familiarity with the instrument allows for quicker and more effective sextant adjustment. It is important to remember that the ability to navigate accurately relies not only on the technology but also on the skill and knowledge of the navigator. In conclusion, sextant adjustment is a fundamental process that ensures the accuracy and reliability of this essential navigational tool. By understanding the mechanics behind the sextant and performing regular adjustments, navigators can confidently traverse the seas and skies, knowing they can pinpoint their location with precision. Mastering the art of sextant adjustment is not just about the instrument; it is about embracing the spirit of exploration and the pursuit of knowledge that has driven humanity to navigate the vast oceans and skies for centuries.

六分仪是导航领域的重要工具，被水手和飞行员广泛使用。有效使用六分仪的关键之一是六分仪调整的过程。这个术语指的是对六分仪进行校准和微调，以确保在测量天体与地平线之间的角度时获得准确的读数。如果没有适当的六分仪调整，导航员可能会发现自己在海上迷失，无法确定自己的确切位置。要理解六分仪调整的重要性，我们首先必须欣赏六分仪的工作原理。六分仪测量天体（如太阳或星星）与地平线之间的角度。这个角度称为高度，对于确定一个人的纬度和经度至关重要。然而，温度变化、机械磨损甚至地球的弯曲等各种因素都可能影响这些测量的准确性。因此，定期进行六分仪调整是维持仪器精度的必要条件。六分仪调整涉及几个步骤。首先，导航员必须确保六分仪处于水平状态。这通常通过附加在仪器上的气泡水平来完成。如果六分仪不水平，它将产生错误的读数。接下来，指数镜必须正确对齐。指数镜是一个关键组件，它反射被测量的天体的图像。如果它未对齐，角度读数将不准确。在确保六分仪水平且指数镜对齐后，导航员可以继续检查零误差。零误差发生在六分仪在应该读数零度时却不读数零度。这可能是由于制造缺陷或随时间推移的磨损造成的。为了解决这个问题，导航员将调整微米鼓直到六分仪在两个镜子对齐时读数为零。除了这些调整外，还必须考虑环境因素。例如，温度可能导致六分仪的金属部件膨胀或收缩，这可能影响其准确性。因此，建议在预期实际导航的类似条件下进行六分仪调整。此外，导航员还必须定期练习使用六分仪。熟悉仪器使得六分仪调整更快、更有效。重要的是要记住，准确导航的能力不仅依赖于技术，还依赖于导航员的技能和知识。总之，六分仪调整是确保这一基本导航工具的准确性和可靠性的基本过程。通过理解六分仪背后的机制并进行定期调整，导航员可以自信地穿越海洋和天空，知道他们可以精确定位自己的位置。掌握六分仪调整的艺术不仅仅是关于仪器；它是关于拥抱探索的精神和推动人类在几个世纪以来导航广阔海洋和天空的知识追求。