.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,日食月食原理解析,作者：乘龙冬鸽,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,日食（光源和障碍物等大时）,偏食,全食,光源,障碍物,偏食,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,日食（光源大于障碍物）,偏食,环食,光源,障碍物,全食,偏食,环食区无限延伸，阴影小到一定程度时的天文现象称之为“凌日”,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,月食（光源大于障碍物）,伪影区不形成月食，观测者在月球看到的是日环食或凌日现象,光源,障碍物,月全食 观测者在月球看到的是日全食,半影月食 月面略暗,观测者在月球看到的是日偏食,
