meridian altitude

简明释义

中天高度

英英释义

例句

1.The sun reaches its highest point in the sky at its meridian altitude, which is often around noon.

太阳在其子午线高度达到天空中的最高点，通常是在中午左右。

2.To get the best view of the solar eclipse, we need to know the meridian altitude of the sun during the event.

为了获得日食的最佳观赏效果，我们需要知道事件期间太阳的子午线高度。

3.Navigators use the meridian altitude of celestial bodies to help with their navigation on the open sea.

航海者利用天体的子午线高度来帮助他们在公海上的导航。

4.Astronomers calculate the meridian altitude of stars to determine their positions in the sky.

天文学家计算星星的子午线高度以确定它们在天空中的位置。

5.The meridian altitude is crucial for determining the optimal time for satellite launches.

对于确定卫星发射的最佳时间，子午线高度至关重要。

作文

The concept of meridian altitude refers to the highest point in the sky that a celestial object reaches when it crosses the local meridian. This phenomenon is crucial for astronomers and navigators, as it provides valuable information about the position of stars, planets, and other celestial bodies relative to Earth. Understanding meridian altitude can enhance our appreciation for astronomy and improve our navigation skills, whether we are sailing across the ocean or simply stargazing in our backyards.To comprehend the significance of meridian altitude, one must first grasp the idea of the celestial sphere. Imagine the sky as a giant sphere surrounding the Earth, with the North and South Poles at the top and bottom, respectively. The equator divides this sphere into two hemispheres. The local meridian is an imaginary line that runs from the North Pole to the South Pole, passing directly overhead through an observer's zenith. When a celestial object, such as the Sun or a star, reaches its highest point in the sky along this line, it is said to be at its meridian altitude.For instance, during the summer solstice, the Sun reaches its maximum meridian altitude at noon in the Northern Hemisphere. This is the time when the Sun is directly overhead at the Tropic of Cancer, resulting in the longest day of the year. Conversely, during the winter solstice, the Sun has a much lower meridian altitude, leading to shorter daylight hours. These variations in meridian altitude throughout the year influence not only the seasons but also the climate and ecosystems of different regions.Navigators have long relied on the principles of meridian altitude to determine their position at sea. By measuring the angle of a celestial body above the horizon at its highest point, sailors can calculate their latitude. This method, known as celestial navigation, has been used for centuries and remains relevant even in the age of GPS technology. Knowing the meridian altitude of a particular star allows navigators to pinpoint their location accurately, ensuring safe passage across vast oceans.Moreover, the study of meridian altitude extends beyond practical applications; it also enriches our understanding of the universe. Astronomers observe how different celestial objects behave as they approach their meridian altitude. For example, the apparent motion of stars can provide insights into the structure of the Milky Way galaxy and the dynamics of celestial mechanics. The higher the meridian altitude, the less atmospheric distortion affects the observation, allowing astronomers to gather clearer data.In conclusion, the term meridian altitude is more than just a technical phrase; it embodies the intersection of science, navigation, and our quest for knowledge about the cosmos. By studying and understanding meridian altitude, we not only enhance our practical skills in navigation but also deepen our connection to the universe. Whether we are sailing on the open sea or gazing at the stars, the concept of meridian altitude serves as a reminder of our place in the vastness of space and time.

“子午线高度”这一概念指的是天体在穿过当地子午线时，达到的天空中最高点。这一现象对天文学家和导航员至关重要，因为它提供了有关恒星、行星和其他天体相对于地球位置的重要信息。理解“子午线高度”可以增强我们对天文学的欣赏，并改善我们的导航技能，无论是航行于海洋还是仅仅在后院仰望星空。要理解“子午线高度”的重要性，首先必须掌握天球的概念。想象天空是一个巨大的球体，包围着地球，北极和南极分别位于顶部和底部。赤道将这个球体分为两个半球。当地子午线是一条从北极到南极的想象线，经过观察者的天顶。当一个天体，如太阳或星星，沿着这条线达到其在天空中的最高点时，称其处于“子午线高度”。例如，在夏至期间，太阳在北半球的正午时达到其最大“子午线高度”。这是太阳在癌症回归线正上方时的时刻，导致一年中白昼最长。相反，在冬至期间，太阳的“子午线高度”要低得多，导致白昼时间缩短。这些“子午线高度”随季节变化影响着不同地区的气候和生态系统。航海者长期以来依赖“子午线高度”的原理来确定他们在海上的位置。通过测量天体在其最高点时相对于地平线的角度，水手可以计算他们的纬度。这种方法被称为天文导航，几个世纪以来一直被使用，即使在GPS技术时代也依然相关。知道某颗星星的“子午线高度”可以让导航员准确定位，确保安全航行。此外，“子午线高度”的研究不仅限于实用应用；它还丰富了我们对宇宙的理解。天文学家观察不同天体在接近其“子午线高度”时的行为。例如，星星的明显运动可以提供关于银河系结构和天体力学动态的见解。“子午线高度”越高，大气扭曲对观测的影响就越小，从而使天文学家能够收集更清晰的数据。总之，“子午线高度”这一术语不仅仅是一个技术术语；它体现了科学、导航与我们对宇宙知识追求的交汇。通过研究和理解“子午线高度”，我们不仅提升了导航的实用技能，还加深了与宇宙的联系。无论是在开阔的海洋中航行，还是仰望星空，“子午线高度”的概念都提醒我们在浩瀚的时空中所处的位置。