描述: 天体的角直径是指从一个特定位置以角度测量的可见直径。在天文学中，角直径是表示天空中天体大小的一种方法。角直径随着天体物理尺寸的增大而增大，当天体距离较远时，角直径会减小。例如，从地球上看月球和太阳，它们的角直径都是半度左右。月球比太阳小约 400 倍，但看起来大小相同（大约半度），因为太阳离地球的距离是月球的约 400 倍。

词条和定义状态： 该术语的英文原始定义已通过天文研究人员和教师的审核
该术语及其定义的译文仍待审核

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