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光线差 (parallax) 是指物体在不同观察点或观察平面上所呈现出的位置差异。这种差异可以由于观察者的移动或物体的移动而产生。光线差在天文学中被用来测量星体距离。在地球表面上，我们可以观察到星星在一年中的位置变化，这种变化叫做视差。通过
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