latitude by ex-meridian altitude

简明释义

近中天高度求纬度

英英释义

例句

1.In astronomy class, we learned about how to determine latitude by ex-meridian altitude using a sextant.

在天文学课堂上，我们学习了如何使用六分仪来确定经纬度计算法。

2.The captain instructed his crew to use latitude by ex-meridian altitude to confirm their location at sea.

船长指示他的船员使用经纬度计算法确认他们在海上的位置。

3.Using latitude by ex-meridian altitude is crucial for accurate celestial navigation.

使用经纬度计算法对于准确的天文导航至关重要。

4.During the sailing competition, the team relied on latitude by ex-meridian altitude for their navigation strategy.

在帆船比赛中，团队依靠经纬度计算法来制定他们的导航策略。

5.The sailor calculated his position using latitude by ex-meridian altitude, which helped him navigate through the fog.

这位水手通过经纬度计算法来确定自己的位置，这帮助他在雾中航行。

作文

Navigating the vast oceans has always been a challenge for sailors and explorers. One of the most important aspects of navigation is determining one’s position on the globe. Among various methods, using celestial bodies like the sun and stars has been a reliable technique for centuries. A particularly interesting method is calculating latitude by ex-meridian altitude, which refers to determining latitude based on the altitude of the sun or other celestial bodies at a specific time, rather than directly at noon when the sun is at its highest point. This method allows navigators to ascertain their position even when they cannot take a traditional noon sighting.To understand latitude by ex-meridian altitude, one must first grasp some basic concepts of celestial navigation. Latitude is the angular distance of a place north or south of the earth's equator, measured in degrees. The ex-meridian altitude involves taking a measurement of the altitude of the sun or another celestial body at a time other than noon. This is crucial because the sun moves across the sky throughout the day, and its position can provide essential clues about one’s location.The process begins with the navigator taking the altitude of the sun at a given time. This requires a sextant, an instrument used to measure the angle between a celestial body and the horizon. Once the altitude is recorded, the navigator uses tables and calculations to determine the sun's declination (its angle relative to the equator) at that time. By combining this information with the observed altitude, the navigator can calculate their latitude.This method is particularly useful because it allows for flexibility in navigation. For instance, if a sailor is unable to take a noon sighting due to clouds or other obstructions, they can still determine their latitude by measuring the sun’s altitude at another time of day. This adaptability is what makes latitude by ex-meridian altitude a valuable tool in maritime navigation.Furthermore, understanding this method also sheds light on the historical context of navigation. Before the invention of modern technology, sailors relied heavily on celestial navigation techniques. The ability to calculate latitude accurately was vital for safe passage across treacherous waters. Explorers like Christopher Columbus and Ferdinand Magellan depended on such methods to chart their courses and discover new lands.In conclusion, the concept of latitude by ex-meridian altitude is an essential aspect of celestial navigation that highlights the ingenuity of early navigators. It demonstrates how knowledge of astronomy and mathematics can be applied to solve practical problems. Today, while we have advanced technologies such as GPS, understanding these traditional methods enriches our appreciation for the art of navigation and the brave explorers who ventured into the unknown. As we continue to explore our world, both on land and at sea, the principles of navigation remain relevant, reminding us of the intricate relationship between humanity and the cosmos.

在浩瀚的海洋中航行一直是水手和探险者面临的挑战之一。导航的一个重要方面是确定自己在地球上的位置。在各种方法中，利用太阳和星星等天体一直是一个可靠的技术。其中一个特别有趣的方法是通过经度外高度计算纬度，这指的是基于太阳或其他天体在特定时间的高度来确定纬度，而不是直接在正午时分太阳处于最高点时进行测量。这种方法使导航员能够在无法进行传统正午观测时，仍然可以确定他们的位置。要理解经度外高度计算纬度，首先必须掌握一些天文导航的基本概念。纬度是指一个地方距离地球赤道的角度，北或南，单位是度。外高度涉及在正午以外的时间测量太阳或其他天体的高度。这一点至关重要，因为太阳在一天中会在天空中移动，其位置可以为我们的位置提供重要线索。这个过程开始于导航员在特定时间记录太阳的高度。这需要使用六分仪，这是一种用于测量天体与地平线之间角度的仪器。一旦记录下高度，导航员就会使用表格和计算来确定该时刻太阳的赤纬（相对于赤道的角度）。通过将这些信息与观察到的高度结合，导航员可以计算出他们的纬度。这种方法特别有用，因为它允许导航的灵活性。例如，如果水手由于云层或其他障碍而无法进行正午观测，他们仍然可以通过在一天中的其他时间测量太阳的高度来确定自己的纬度。这种适应性使得经度外高度计算纬度成为海上导航中的一种宝贵工具。此外，理解这种方法也揭示了导航的历史背景。在现代科技发明之前，水手们在很大程度上依赖天文导航技术。准确计算纬度的能力对安全穿越危险水域至关重要。像克里斯托弗·哥伦布和费迪南德·麦哲伦这样的探险者依靠这种方法来绘制航线和发现新土地。总之，经度外高度计算纬度的概念是天文导航的重要组成部分，突显了早期导航员的聪明才智。它展示了如何将天文学和数学知识应用于解决实际问题。如今，虽然我们拥有先进的技术如GPS，但理解这些传统方法丰富了我们对导航艺术的欣赏，以及那些勇敢探索未知的探险者。随着我们继续探索世界，无论是在陆地还是海洋，导航原理仍然具有相关性，提醒我们人类与宇宙之间错综复杂的关系。