right ascension

简明释义

赤经

英英释义

例句

1.In astronomy, right ascension 赤经 is measured in hours, minutes, and seconds.

在天文学中，right ascension 赤经以小时、分钟和秒来测量。

2.The telescope's settings were adjusted based on the right ascension 赤经 of the celestial object.

望远镜的设置是根据天体的right ascension 赤经进行调整的。

3.The chart displayed the right ascension 赤经 of various stars for easy navigation.

图表显示了各种星星的right ascension 赤经以便于导航。

4.The astronomer calculated the right ascension 赤经 of the star to determine its position in the sky.

天文学家计算了这颗星星的right ascension 赤经以确定它在天空中的位置。

5.To locate the planet, we need its right ascension 赤经 and declination.

为了找到这颗行星，我们需要它的right ascension 赤经和赤纬。

作文

The concept of right ascension is fundamental in the field of astronomy, particularly when it comes to locating celestial objects in the night sky. Right ascension, which is often abbreviated as RA, is one of the two coordinates used in the equatorial coordinate system, the other being declination. This system is similar to the latitude and longitude system used on Earth, but instead of measuring distances on our planet, it measures positions in the celestial sphere. Understanding right ascension allows astronomers and stargazers alike to pinpoint the locations of stars, planets, and other astronomical phenomena with remarkable precision.Right ascension is measured in hours, minutes, and seconds, with the entire celestial sphere divided into 24 hours. This division corresponds to the Earth's rotation, as it takes approximately 24 hours for the Earth to complete one full rotation relative to the stars. Each hour of right ascension represents 15 degrees of angular distance, making it a convenient system for tracking the movement of celestial bodies across the sky.To visualize this, imagine standing outside on a clear night and looking up at the stars. If you want to find a specific star, you would first need to know its right ascension and declination. The right ascension tells you how far along the celestial equator the star is located, while the declination indicates how far north or south it is from that equator. For example, if a star has a right ascension of 5 hours, it means that it is positioned 75 degrees east of the vernal equinox point, which is a reference point in the sky.One interesting aspect of right ascension is that it changes throughout the year due to the Earth's orbit around the Sun. As the Earth moves, the background stars appear to shift slightly, causing the right ascension of certain stars to change. This phenomenon is known as the precession of the equinoxes, and it is essential for astronomers to take this into account when observing celestial objects over time.In practical terms, amateur astronomers can use star charts or mobile applications that provide right ascension and declination values to locate stars and constellations. By entering the right ascension and declination into a telescope's computer system, users can easily center their view on the desired celestial object. This capability has revolutionized stargazing, allowing enthusiasts to explore the cosmos more effectively than ever before.In conclusion, the term right ascension plays a crucial role in the study of astronomy. It provides a systematic way to measure the position of celestial objects, making it easier for both professionals and amateurs to navigate the night sky. As we continue to explore the universe, understanding concepts like right ascension will remain essential for uncovering the mysteries of the cosmos and enhancing our appreciation for the beauty of the stars above us.

在天文学领域，赤经的概念是基础，特别是在定位夜空中的天体时。赤经通常缩写为RA，是赤道坐标系统中使用的两个坐标之一，另一个是天体的赤纬。这一系统类似于地球上使用的纬度和经度系统，但它测量的是星空中的位置，而不是我们星球上的距离。理解赤经使天文学家和观星者能够以惊人的精确度确定恒星、行星和其他天文现象的位置。赤经的测量单位为小时、分钟和秒，整个天球被划分为24小时。这种划分对应于地球的自转，因为地球大约需要24小时才能完成相对于恒星的完整自转。每小时的赤经代表15度的角距，使其成为跟踪天体在天空中运动的便捷系统。想象一下，在一个晴朗的夜晚站在户外，仰望星空。如果你想找到某颗特定的星星，你首先需要知道它的赤经和赤纬。赤经告诉你这颗星星位于天赤道的多远，而赤纬则指示它与赤道的南北距离。例如，如果一颗星星的赤经为5小时，这意味着它位于春分点（天上的一个参考点）以东75度的位置。赤经的一个有趣方面是，由于地球围绕太阳的轨道，随着年份的变化，它会发生变化。随着地球的移动，背景星星似乎会稍微偏移，导致某些星星的赤经发生变化。这种现象称为春分点的岁差，天文学家在观察天体随时间的变化时必须考虑这一点。在实际应用中，业余天文学家可以使用星图或提供赤经和赤纬值的移动应用程序来定位星星和星座。通过将赤经和赤纬输入到望远镜的计算机系统中，用户可以轻松将视野集中在所需的天体上。这一能力彻底改变了观星活动，使爱好者能够比以往任何时候都更有效地探索宇宙。总之，术语赤经在天文学研究中扮演着至关重要的角色。它提供了一种系统化的方法来测量天体的位置，使专业人士和业余爱好者更容易导航夜空。随着我们继续探索宇宙，理解像赤经这样的概念将继续对揭开宇宙的奥秘和增强我们对星空之美的欣赏至关重要。