词条 半影
描述: 半影（拉丁语，意为 "几乎被阴影覆盖"）有两种含义。
第一，半影是指日食或月食时投射到天体上的阴影的外围较暗的部分，其中光线仅被部分遮挡。例如，在日食中，位于半影区的观测者只能看到月球部分遮住太阳，只能看到日偏食。
第二，半影是指太阳黑子清晰可辨的外侧较亮的部分。
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