描述: 当月球进入地球的阴影时，就会发生月食。只有当地球位于太阳和月球之间，并且太阳、地球和月球几乎排成一列直线时，才会发生。因此，月食只能发生在满月之夜。当月球完全进入地球的阴影之中时，发生的是月全食。当月球仅有一部分被地球阴影覆盖时，发生的是月偏食。月食的类型和持续时间，取决于月食发生时月球在其绕地球公转轨道上的精确位置。

相关词条

• 日蚀
• 阴影

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