longitude by lunar distances

简明释义

月角距求取的经度

英英释义

例句

1.Using longitude by lunar distances, explorers could chart new territories with greater accuracy.

利用通过月球距离测定经度，探险者可以更准确地绘制新领土。

2.The captain explained how they would find their longitude by lunar distances during their voyage.

船长解释了他们如何在航行中找到通过月球距离测定经度。

3.The method of calculating longitude by lunar distances was crucial for navigation before the invention of accurate clocks.

在精确时钟发明之前，计算通过月球距离测定经度的方法对航海至关重要。

4.In his studies, he focused on longitude by lunar distances as a way to improve maritime navigation.

在他的研究中，他专注于通过月球距离测定经度，以改善海洋导航。

5.Sailors in the 18th century used longitude by lunar distances to determine their position at sea.

18世纪的水手使用通过月球距离测定经度来确定他们在海上的位置。

作文

The history of navigation is filled with fascinating developments that have shaped our understanding of the world. One of the most significant advancements was the ability to determine one's position at sea, particularly in terms of longitude. For centuries, sailors relied on various methods to navigate vast oceans, but it wasn't until the 18th century that a reliable technique emerged: longitude by lunar distances. This method allowed navigators to calculate their east-west position using the moon's position relative to the stars and the horizon.Before the advent of longitude by lunar distances, determining longitude was a daunting challenge. Sailors could easily measure latitude by observing the position of the sun or stars, but without accurate timekeeping, calculating longitude remained elusive. The Earth rotates 360 degrees in about 24 hours, which means it rotates approximately 15 degrees every hour. To find their longitude, sailors needed to know the exact time at a reference point, usually Greenwich, England. However, accurate clocks were not available until John Harrison invented the marine chronometer in the 18th century.The longitude by lunar distances method circumvented the need for precise clocks by utilizing the predictable motion of the moon. Navigators would measure the angle between the moon and a specific star or celestial body. By comparing these measurements with tables that predicted the moon's position, sailors could determine the difference in time between their local time and the time at Greenwich. This time difference could then be converted into degrees of longitude, allowing them to pinpoint their location on the globe.The significance of longitude by lunar distances cannot be overstated. It revolutionized maritime navigation and contributed to safer and more efficient sea travel. With this technique, sailors could explore new territories, establish trade routes, and connect distant lands. The ability to accurately determine longitude also played a crucial role in the Age of Exploration, enabling explorers like Captain James Cook to chart uncharted waters and make significant discoveries.Despite its importance, the method of longitude by lunar distances was not without its challenges. It required a solid understanding of astronomy and mathematics, as well as precise instruments to take accurate measurements. Furthermore, weather conditions could affect visibility, making it difficult to observe celestial bodies. Nevertheless, skilled navigators who mastered this technique became invaluable assets to their crews and nations.In modern times, the invention of GPS technology has rendered traditional methods of navigation, including longitude by lunar distances, largely obsolete. However, understanding the historical context and development of such techniques enriches our appreciation for the ingenuity of past navigators. It highlights the human quest for exploration and the lengths to which people went to understand their place in the world.In conclusion, the method of longitude by lunar distances represents a remarkable achievement in the field of navigation. It exemplifies the intersection of science, exploration, and human determination. As we navigate our modern world, it is essential to remember the contributions of those who came before us and the innovative techniques that paved the way for future generations of explorers. The legacy of longitude by lunar distances serves as a testament to the enduring spirit of discovery that continues to drive humanity forward.

航海史上充满了迷人的发展，这些发展塑造了我们对世界的理解。其中最重要的进步之一是确定在海上的位置，特别是经度的能力。几个世纪以来，水手依靠各种方法来导航广阔的海洋，但直到18世纪，一种可靠的技术才出现：通过月亮距离计算经度。这种方法允许导航员利用月亮与星星和地平线之间的位置关系来计算他们的东西方位置。在通过月亮距离计算经度出现之前，确定经度是一项艰巨的挑战。水手可以通过观察太阳或星星的位置轻松测量纬度，但没有准确的计时工具，计算经度仍然难以实现。地球在大约24小时内旋转360度，这意味着它每小时大约旋转15度。为了找到他们的经度，水手需要知道一个参考点（通常是英国格林威治）的确切时间。然而，直到18世纪，约翰·哈里森发明了海洋计时器，准确的时钟才得以问世。通过月亮距离计算经度的方法通过利用月亮的可预测运动绕过了对精确时钟的需求。导航员会测量月亮与特定星星或天体之间的角度。通过将这些测量与预测月亮位置的表格进行比较，水手可以确定他们当地时间与格林威治时间之间的差异。这个时间差可以转换为经度度数，使他们能够在地球上准确定位。通过月亮距离计算经度的重要性不容小觑。它彻底改变了海洋导航，并有助于更安全、更高效的海上旅行。通过这种技术，水手能够探索新领土，建立贸易路线，并连接遥远的土地。准确确定经度的能力在探索时代也发挥了至关重要的作用，使得詹姆斯·库克船长等探险家能够绘制未知水域并取得重大发现。尽管其重要性，通过月亮距离计算经度的方法并非没有挑战。它需要扎实的天文学和数学知识，以及精确的仪器来进行准确的测量。此外，天气条件可能影响能见度，使观察天体变得困难。然而，掌握这一技术的熟练导航员成为他们船员和国家的宝贵资产。在现代，GPS技术的发明使传统的导航方法，包括通过月亮距离计算经度，在很大程度上变得过时。然而，理解这些技术的历史背景和发展丰富了我们对过去导航者聪明才智的欣赏。它突显了人类探索的追求，以及人们为理解自己在世界中的位置而付出的努力。总之，通过月亮距离计算经度的方法代表了导航领域的一项显著成就。它例证了科学、探索和人类决心的交汇点。当我们在现代世界中航行时，记住那些先辈们的贡献以及为未来一代探险者铺平道路的创新技术至关重要。通过月亮距离计算经度的遗产作为对推动人类不断向前发展的探索精神的见证，值得铭记。