Description: 若地球、月球和太阳排成一条直线，且月球位于地球和太阳之间，则会发生日食。从地球表面观测时，月球圆面覆盖了天空中的太阳圆面；在太空中观测时，我们可以看到月球的影子在地球的昼半球上移动。

日食有不同的类型。日全食是指月球圆面完全覆盖太阳；日偏食是指即使在食甚时，太阳圆面也只有一部分被覆盖；日环食是指月球与地球的距离比平均值远，因此看起来比平时小，即使在食甚时也能看到太阳圆面的一圈圆环。

日全食期间，地球上月影最暗处称为“本影”，月影边缘称为“半影”。位于本影内的观测者看到的是日全食，而位于半影内的观测者看到的是日偏食。

Related Terms:

• 日蚀
• 月球
• 太阳
• 阴影

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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