annual parallax

简明释义

周年视差

英英释义

例句

1.By measuring the annual parallax (年视差), scientists can infer the distance to the nearest stars.

通过测量年视差（annual parallax），科学家可以推断到最近恒星的距离。

2.Astronomers use annual parallax (年视差) to determine how far away nearby stars are from Earth.

天文学家使用年视差（annual parallax）来确定附近恒星离地球的距离。

3.The annual parallax (年视差) of a star is the apparent shift in its position as observed from different points in Earth's orbit.

恒星的年视差（annual parallax）是从地球轨道的不同点观察时其位置的明显变化。

4.The measurement of the star's distance can be calculated using the concept of annual parallax (年视差).

通过使用年视差（annual parallax）的概念，可以计算星星的距离。

5.The annual parallax (年视差) is typically measured in arcseconds.

通常使用角秒来测量年视差（annual parallax）。

作文

The concept of annual parallax is fundamental in the field of astronomy, as it provides a method for measuring the distances to nearby stars. It refers to the apparent shift in position of a star against the background of more distant stars when observed from different positions of the Earth's orbit around the Sun. This phenomenon occurs due to the change in the observer's viewpoint as the Earth moves along its elliptical path. Understanding annual parallax is crucial for astronomers because it allows them to calculate how far away celestial objects are, which in turn helps in constructing a three-dimensional map of our galaxy.When we observe a star from one position in January and then from another position six months later in July, we can see a slight shift in the star's position relative to the distant stars that do not move appreciably in our line of sight. This shift is measured in arcseconds, and the maximum angle of this shift is what we refer to as annual parallax. The formula for calculating the distance to a star based on its annual parallax is relatively straightforward: distance in parsecs is equal to 1 divided by the parallax angle in arcseconds. For example, if a star has a parallax of 0.1 arcseconds, it is located 10 parsecs away from Earth.The significance of annual parallax extends beyond mere distance measurements; it also plays a vital role in understanding the scale of the universe. Before the advent of modern technology, such as space telescopes, astronomers relied heavily on this technique to establish the cosmic distance ladder. By determining the distances to nearby stars through annual parallax, astronomers could then use these measurements to infer the distances to more remote celestial bodies, thus expanding our knowledge of the universe.In addition to its practical applications, annual parallax also serves as an excellent illustration of the principle of triangulation. This method, which is used in various fields, including navigation and surveying, relies on measuring angles in a triangle formed by three points. In the case of annual parallax, the two points are the two positions of the Earth in its orbit, and the third point is the star being observed. By knowing the baseline distance between the two positions of the Earth and measuring the angles involved, astronomers can effectively triangulate the star's position in space.Despite its importance, measuring annual parallax can be challenging due to several factors. Atmospheric disturbances, light pollution, and the inherent limitations of telescopes can all affect the precision of the measurements. However, advancements in technology, such as the development of space-based telescopes like the Hubble Space Telescope, have significantly improved our ability to measure annual parallax with greater accuracy.In conclusion, the concept of annual parallax is not only a cornerstone of astronomical measurement but also a gateway to understanding the vastness of the universe. It allows us to quantify the distances to stars, thereby enriching our comprehension of the cosmos. As we continue to explore the universe, the principles behind annual parallax will remain essential tools in our quest to uncover the mysteries of space and time.

“年视差”这一概念在天文学领域中至关重要，因为它提供了一种测量附近恒星距离的方法。它指的是当从地球绕太阳的不同位置观察一颗恒星时，该恒星相对于更遥远的恒星背景的位置的明显变化。这种现象是由于观察者的视角随着地球沿其椭圆轨道移动而发生变化。理解“年视差”对天文学家至关重要，因为它使他们能够计算天体的距离，这反过来又有助于构建我们银河系的三维地图。当我们从一月份的一个位置观察一颗恒星，然后在七月份的另一个位置观察同一颗恒星时，我们可以看到这颗恒星相对于那些在我们视线中不太移动的遥远恒星的位置发生了轻微的变化。这种变化以弧秒为单位进行测量，而这种变化的最大角度就是我们所称的“年视差”。根据“年视差”计算恒星距离的公式相对简单：距离（以秒差距为单位）等于1除以视差角（以弧秒为单位）。例如，如果一颗恒星的视差为0.1弧秒，则它距离地球10秒差距。“年视差”的重要性不仅限于简单的距离测量；它还在理解宇宙的规模方面发挥着至关重要的作用。在现代技术（如太空望远镜）出现之前，天文学家在建立宇宙距离阶梯时严重依赖这一技术。通过通过“年视差”确定附近恒星的距离，天文学家可以利用这些测量结果推断更遥远天体的距离，从而扩展我们对宇宙的认识。除了其实际应用外，“年视差”还很好地说明了三角测量原理。这种方法在包括导航和测量等各个领域中被广泛使用，依赖于测量由三个点形成的三角形中的角度。在“年视差”的情况下，这两个点是地球在其轨道上的两个位置，而第三个点是被观察的恒星。通过知道地球两个位置之间的基线距离并测量相关角度，天文学家可以有效地三角测量恒星在空间中的位置。尽管其重要性，“年视差”的测量可能会由于几个因素而变得具有挑战性。大气干扰、光污染以及望远镜固有的局限性都可能影响测量的精确性。然而，技术的进步，例如哈勃太空望远镜等太空望远镜的发展，显著提高了我们以更高精度测量“年视差”的能力。总之，“年视差”这一概念不仅是天文测量的基石，也是理解宇宙浩瀚的一个途径。它使我们能够量化恒星的距离，从而丰富我们对宇宙的理解。随着我们继续探索宇宙，围绕“年视差”的原则将始终是我们揭示空间与时间奥秘的重要工具。