semidiameter correction

简明释义

半径差改正量

英英释义

例句

1.In his calculations, the engineer included a semidiameter correction to ensure precision.

在他的计算中，工程师加入了半径修正以确保精确度。

2.To improve the accuracy of the star map, a semidiameter correction was utilized.

为了提高星图的准确性，使用了半径修正。

3.When observing the moon, the scientist noted the semidiameter correction for its apparent size.

在观察月球时，科学家注意到其表观大小的半径修正。

4.The astronomer applied the semidiameter correction to accurately measure the planet's size.

天文学家应用了半径修正来准确测量行星的大小。

5.The telescope's settings required a semidiameter correction for optimal viewing.

望远镜的设置需要进行半径修正以获得最佳视野。

作文

In the field of astronomy and navigation, precision is paramount. One of the critical aspects that contribute to accurate measurements is the concept of semidiameter correction. This term refers to the adjustment made to account for the apparent size of celestial bodies, such as the sun or the moon, when observed from Earth. Understanding this correction is essential for astronomers and navigators alike, as it ensures that their calculations reflect the true position of these heavenly bodies. The semidiameter correction is particularly important when measuring the altitude of a celestial body above the horizon. When observing the sun at sunrise or sunset, for instance, its lower limb appears to touch the horizon before the entire disk is visible. This optical illusion is due to the Earth's atmosphere refracting light, making the sun appear higher than it actually is. To achieve accurate readings, observers must apply the semidiameter correction, which adjusts for the size of the sun's disk and its position relative to the horizon. This correction is not only applicable to the sun but also to other celestial bodies. For example, when determining the position of the moon or planets, astronomers must consider their angular size. Each celestial body has a specific semidiameter, which is half of its diameter. By applying the semidiameter correction, astronomers can adjust their measurements to account for this size, leading to more precise calculations in their observations. In practical terms, the semidiameter correction can be calculated using known values of the celestial body's diameter and the distance from Earth. For instance, the sun has a mean diameter of about 1.4 million kilometers, and its average distance from Earth is approximately 149.6 million kilometers. Using these figures, astronomers can compute the sun's semidiameter and apply the necessary correction to their altitude measurements. Moreover, the significance of the semidiameter correction extends beyond mere academic interest; it has real-world implications for navigation. Sailors and pilots rely on precise celestial navigation techniques, where accurate measurements of celestial bodies guide their courses. Any error in these measurements, however small, can lead to significant deviations in navigation, potentially resulting in dangerous situations. Therefore, understanding and applying the semidiameter correction is crucial for safe and efficient travel across the seas and skies. In conclusion, the semidiameter correction is an essential concept in both astronomy and navigation. It allows observers to make accurate adjustments for the apparent size of celestial bodies, ensuring that their measurements reflect reality. As we continue to explore our universe and navigate our world, the importance of such corrections cannot be overstated. Mastery of the semidiameter correction is a testament to the intricate relationship between mathematics, science, and the natural world, highlighting the need for precision in our quest for knowledge and safety.

在天文学和导航领域，精确性至关重要。影响准确测量的关键方面之一是“半直径修正”这一概念。这个术语指的是对从地球观察到的天体（如太阳或月亮）表观大小进行的调整。理解这一修正对于天文学家和导航员来说至关重要，因为它确保他们的计算反映出这些天体的真实位置。“半直径修正”在测量天体在地平线上方的高度时尤为重要。例如，在日出或日落时观察太阳，其下缘似乎在地平线上触及，而整个圆盘在此之前并不可见。这种光学错觉是由于地球大气折射光线，使得太阳看起来比实际位置更高。为了获得准确的读数，观察者必须应用“半直径修正”，以调整太阳圆盘的大小及其相对于地平线的位置。这一修正不仅适用于太阳，还适用于其他天体。例如，在确定月球或行星的位置时，天文学家必须考虑它们的角大小。每个天体都有一个特定的半直径，即其直径的一半。通过应用“半直径修正”，天文学家可以调整他们的测量，以考虑这一大小，从而使观察中的计算更加精确。在实际操作中，“半直径修正”可以使用已知的天体直径和距离地球的距离进行计算。例如，太阳的平均直径约为140万公里，而其与地球的平均距离约为1.496亿公里。利用这些数据，天文学家可以计算出太阳的半直径，并将必要的修正应用于他们的高度测量。此外，“半直径修正”的重要性超越了学术兴趣；它对导航有着现实的影响。水手和飞行员依赖精确的天体导航技术，准确测量天体的位置以指导他们的航向。然而，这些测量中的任何误差，无论多么微小，都可能导致导航上的重大偏差，可能会导致危险的情况。因此，理解和应用“半直径修正”对于安全和高效的海洋和空中旅行至关重要。总之，“半直径修正”是天文学和导航中一个重要的概念。它使观察者能够对天体的表观大小进行准确的调整，确保他们的测量反映现实。随着我们继续探索宇宙和导航世界，这种修正的重要性不容小觑。掌握“半直径修正”是数学、科学与自然世界之间复杂关系的见证，突显了在追求知识和安全的过程中对精确性的需求。