annual parallax

简明释义

恒星视差

英英释义

例句

1.The measurement of the star's distance can be determined using annual parallax, which is the apparent shift in position due to Earth's orbit.

通过使用年视差，可以确定星星的距离，这种视差是由于地球的轨道导致的位置变化。

2.To accurately measure annual parallax, astronomers observe a star at different times of the year.

为了准确测量年视差，天文学家在一年中的不同时间观察一颗恒星。

3.The concept of annual parallax was crucial in developing the distance scale for the universe.

年视差的概念在建立宇宙距离尺度方面至关重要。

4.Understanding annual parallax helps scientists determine the scale of the Milky Way galaxy.

理解年视差有助于科学家确定银河系的规模。

5.Astronomers rely on annual parallax to calculate how far away nearby stars are from Earth.

天文学家依靠年视差来计算附近恒星离地球有多远。

作文

The concept of annual parallax is fundamental in the field of astronomy, particularly when it comes to measuring the distances to stars and other celestial objects. To understand this term better, we need to delve into the nature of parallax itself. Parallax refers to the apparent shift in the position of an object when viewed from different angles. In astronomy, this phenomenon is utilized to determine how far away stars are from Earth. The annual parallax specifically relates to the yearly movement of the Earth around the Sun, which creates a baseline for measuring these distances.When the Earth orbits the Sun, it moves in a circular path. As it does so, nearby stars appear to shift position against the more distant background stars. This effect can be observed at different times of the year, typically six months apart, when the Earth is on opposite sides of its orbit. By measuring the angle of this shift, astronomers can calculate the distance to a star using simple trigonometry. The smaller the angle of parallax, the further away the star is. For example, if a star exhibits a parallax angle of one arcsecond, it is located approximately 3.26 light-years away from us. This unit of measurement is known as a parsec. The ability to measure annual parallax has revolutionized our understanding of the universe, allowing astronomers to create a three-dimensional map of our galaxy and beyond.However, measuring annual parallax is not without its challenges. Many factors can affect the accuracy of these measurements, such as atmospheric distortion, instrumental errors, and the inherent limitations of our observational technology. Despite these challenges, advancements in technology, such as space telescopes, have significantly improved our ability to measure parallax accurately. The Hubble Space Telescope, for instance, has provided invaluable data that has refined our understanding of stellar distances.In addition to measuring distances, annual parallax plays a crucial role in determining the scale of the universe. By knowing how far away various stars are, astronomers can better understand the structure and dynamics of our galaxy. This knowledge is essential for studying the formation and evolution of stars, galaxies, and the universe as a whole.Furthermore, the principle of annual parallax extends beyond just measuring distances to stars. It also applies to other celestial bodies, such as planets within our solar system. By observing the parallax of planets as the Earth orbits the Sun, astronomers can gain insights into their distances and orbits, enhancing our overall understanding of planetary science.In conclusion, the term annual parallax encapsulates a vital method in astronomy for measuring the distances to stars and other celestial objects. This technique not only helps us map our galaxy but also deepens our understanding of the universe's structure and evolution. As technology continues to advance, the precision of annual parallax measurements will undoubtedly improve, leading to even greater discoveries in the field of astronomy. The journey to comprehend the vastness of space is ongoing, and annual parallax remains a key tool in unraveling its mysteries.

“年视差”这个概念在天文学领域中至关重要，尤其是在测量星星和其他天体的距离时。要更好地理解这个术语，我们需要深入探讨视差的本质。视差是指当从不同角度观察一个物体时，物体位置的表观变化。在天文学中，这种现象被用来确定星星离地球有多远。“年视差”特别与地球围绕太阳的年度运动有关，这为测量这些距离创造了基线。当地球绕太阳公转时，它沿着圆形轨道移动。随着它的运动，附近的星星相对于更遥远的背景星星似乎发生了位置移动。这种效应可以在一年中的不同时间观察到，通常是相隔六个月，当地球位于其轨道的对面时。通过测量这种位移的角度，天文学家可以利用简单的三角学计算出星星的距离。“年视差”角度越小，星星就越远。例如，如果一颗星星表现出一个弧秒的视差角度，那么它大约位于我们3.26光年的距离外。这个测量单位被称为秒差距。测量“年视差”的能力彻底改变了我们对宇宙的理解，使天文学家能够创建我们银河系及更远的三维地图。然而，测量“年视差”并非没有挑战。许多因素可能会影响这些测量的准确性，例如大气扭曲、仪器误差以及我们观测技术的固有限制。尽管面临这些挑战，科技的进步，例如太空望远镜，显著提高了我们准确测量视差的能力。例如，哈勃太空望远镜提供了宝贵的数据，精确了我们对恒星距离的理解。除了测量距离，“年视差”在确定宇宙的尺度方面也发挥着至关重要的作用。通过了解各种星星的距离，天文学家可以更好地理解我们银河系的结构和动态。这些知识对于研究恒星、星系及整个宇宙的形成和演化至关重要。此外，“年视差”的原理不仅限于测量星星的距离。它还适用于我们太阳系内的其他天体。通过观察行星的视差，天文学家可以获得关于它们距离和轨道的见解，从而增强我们对行星科学的整体理解。总之，术语“年视差”概括了一种在天文学中测量星星和其他天体距离的重要方法。这项技术不仅帮助我们绘制银河系的地图，还加深了我们对宇宙结构和演化的理解。随着技术的不断进步，“年视差”测量的精确度无疑会提高，从而在天文学领域带来更伟大的发现。探索太空广袤的旅程仍在继续，而“年视差”依然是揭示其奥秘的关键工具。