"Astrometry"是指天文学中的一种测量技术，用于确定天体在宇宙中的位置和运动。它涉及到使用各种方法和技术来测量天体的位置、速度和运动方向，以了解宇宙的结构和演化。
以下是一篇关于astrometry的英文范文，供您参考：
Title: Astrometry: Understanding the Universe through Measurements
Astrometry is an essential tool in astronomy, allowing researchers to study the positions, movements, and motions of celestial objects. By using precise measurements of stars, galaxies, and other celestial bodies, astrometry helps us understand the structure and evolution of the universe.
The technique involves using various methods and technologies to determine the locations of celestial objects with high accuracy. This includes using optical telescopes to observe stars and other bright objects, as well as using radio telescopes to detect the positions of galaxies and other objects that emit radio waves. Once the positions of the objects are measured, they can be used to study their movements and determine their trajectories over time.
Astrometry has been used for centuries to study the positions of stars and constellations. However, modern techniques have greatly improved the accuracy and precision of these measurements, allowing researchers to study smaller and more distant objects in greater detail. This has led to a greater understanding of the structure and evolution of the universe, including the formation of galaxies and the distribution of matter throughout it.
Astrometry is also important for studying exoplanets, which are planets outside our solar system. By measuring the positions and movements of these exoplanets, astronomers can determine their masses, orbits, and other properties that help us understand their environments and potential habitability.
In conclusion, astrometry is a crucial tool in astronomy that allows researchers to study the positions, movements, and motions of celestial objects. By using precise measurements, astrometry has contributed to our understanding of the structure and evolution of the universe, including the formation of galaxies and exoplanets.
astrometry是天文学中的一种技术，用于测量和确定天体位置和运动。
在英文范文当中，astrometry可能会出现在描述宇宙学、天文学等领域的文章中，用于解释星系、恒星、行星等天体的位置和运动规律。
astrometry的意思是天体测量学。
在英文范文当中，astrometry常用于描述对星体、星系、行星等天文学的研究，如天体位置、运动轨迹、星表编制等天文学基础学科。