longitude by transit

简明释义

中天求经度

英英释义

例句

1.To calculate longitude by transit, one must observe the time of a celestial event.

要计算经度测量法，必须观察天文事件的时间。

2.The use of longitude by transit was revolutionary in the 18th century for maritime navigation.

在18世纪，使用经度测量法对海上导航来说是革命性的。

3.The explorers used longitude by transit to pinpoint their location during their journey across the ocean.

探险家们在横渡海洋的旅程中使用经度测量法来确定他们的位置。

4.In navigation, longitude by transit is essential for accurate mapping and charting of routes.

在导航中，经度测量法对于精确绘制路线和制图至关重要。

5.Sailors often determine their position at sea using the method of longitude by transit, which involves measuring the angle of celestial bodies.

水手们经常通过经度测量法来确定他们在海上的位置，这涉及到测量天体的角度。

作文

The concept of determining one's position on Earth has fascinated humanity for centuries. Among the various methods developed over time, the technique known as longitude by transit has played a crucial role in navigation and geography. This method involves using celestial bodies, particularly the sun or stars, to accurately measure longitude. Understanding how this technique works can provide valuable insights into both historical and modern navigation practices.To grasp the significance of longitude by transit, it is essential to first understand what longitude is. Longitude refers to the geographic coordinate that specifies the east-west position of a point on the Earth's surface. Unlike latitude, which measures how far north or south a location is from the equator, longitude is measured in degrees from the Prime Meridian, which runs through Greenwich, England. The accurate determination of longitude has been a challenge for sailors and explorers throughout history, leading to the development of various navigational tools and methods.The longitude by transit method specifically involves observing the transit of a celestial body across the local meridian, which is an imaginary line that runs from the North Pole to the South Pole and passes through a specific location. By noting the exact time when a celestial body crosses this line, navigators can calculate their local solar time. This is crucial because the Earth rotates at a rate of 15 degrees of longitude per hour, meaning that each hour corresponds to a difference of 15 degrees in longitude.To apply the longitude by transit method, one must have a precise timekeeping device, such as a chronometer, which can keep accurate time regardless of the ship's movement. By comparing the local solar time obtained from the celestial observation with Coordinated Universal Time (UTC), navigators can determine their longitudinal position. This method was particularly important before the invention of the marine chronometer, as it allowed sailors to navigate the vast oceans with greater accuracy.Historically, the use of longitude by transit was instrumental during the Age of Exploration. Explorers like Captain James Cook utilized this technique to chart new territories and improve maritime navigation. The ability to accurately determine longitude not only enhanced safety at sea but also opened up new trade routes and facilitated global exploration.In contemporary times, while advanced technologies such as GPS have largely replaced traditional methods, the principles behind longitude by transit remain relevant. Understanding these historical techniques enriches our appreciation of navigation's evolution and highlights the ingenuity of those who came before us. Furthermore, studying such methods can inspire innovation in current navigation technologies, as they remind us of the fundamental challenges faced by early navigators.In conclusion, the technique of longitude by transit represents a significant milestone in the history of navigation. It showcases the human quest for knowledge and the desire to explore the unknown. By studying this method, we not only gain insight into the past but also foster a deeper understanding of the complexities involved in determining our place on Earth. As we continue to advance technologically, it is vital to remember the foundations laid by those who navigated the seas using the stars, ensuring that their legacy lives on in modern exploration and navigation practices.

确定一个人在地球上的位置的概念吸引了人类几个世纪。 在历史上发展出的方法中，称为经度通过天体过境的技术在导航和地理中发挥了重要作用。 这种方法涉及使用天体，特别是太阳或星星，来准确测量经度。 理解这一技术的工作原理可以为我们提供宝贵的见解，了解历史和现代的导航实践。要理解经度通过天体过境的重要性，首先必须了解经度是什么。 经度是指指定地球表面某一点东西位置的地理坐标。 与纬度不同，纬度测量一个地点距离赤道的南北距离，经度则从穿过英国格林威治的本初子午线开始以度数进行测量。 准确确定经度一直是航海者和探险者面临的挑战，这导致了各种导航工具和方法的发展。经度通过天体过境方法特别涉及观察天体穿过当地子午线的过程，子午线是从北极到南极的想象线，经过特定位置。 通过记录天体穿过这条线的确切时间，导航员可以计算他们的当地太阳时间。 这是至关重要的，因为地球以每小时15度的速度自转，这意味着每个小时对应于经度的15度差异。要应用经度通过天体过境方法，必须有一个精确的计时设备，例如海洋计时器，它能够在船只运动的情况下保持准确的时间。 通过将从天体观察获得的当地太阳时间与协调世界时（UTC）进行比较，导航员可以确定他们的经度位置。 这种方法在海洋计时器发明之前尤其重要，因为它使水手能够更准确地导航广阔的海洋。在历史上，使用经度通过天体过境在探索时代发挥了重要作用。 诸如詹姆斯·库克船长等探险家利用这一技术绘制新领土并改善海上导航。 准确确定经度的能力不仅提高了海上的安全性，还开辟了新的贸易路线，促进了全球探索。在当代，尽管先进的技术如GPS在很大程度上取代了传统方法，但经度通过天体过境背后的原理仍然相关。 理解这些历史技术丰富了我们对导航演变的欣赏，并突显了那些在我们之前的人的创造力。 此外，研究这些方法可以激励当前导航技术的创新，因为它们提醒我们早期导航者面临的基本挑战。总之，经度通过天体过境技术代表了导航历史上的一个重要里程碑。 它展示了人类对知识的追求和探索未知的愿望。 通过研究这一方法，我们不仅获得了对过去的洞察力，还加深了对确定我们在地球上位置的复杂性的理解。 随着我们不断技术进步，记住那些通过星星导航海洋的人的基础是至关重要的，确保他们的遗产在现代探索和导航实践中得以延续。