以下为句子列表：
英文: In Astrometry, the term is applied to the difference between the observed position (or magnitude) of a reference star and the position (or magnitude) listed in the star catalog.
中文: 在天文上，本术语指的是观测的参考星的位置（或星等）与星表上的该星的位置（或星等）的差值。
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英文: The idea is to monitor a reference star (which can be an artificial “star” created by shining a laser into the upper atmosphere) and adjusting the shape of a mirror to keep this star in focus.
中文: 方法是监控一个参考恒星（可用雷射射到大气层上方，制造一颗「人工恒星」），并调整镜子的形状，让这颗恒星保持成焦。
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