We must not forget to open the aperture at the second contact . 在食既时不要忘记放大光圈。
2.
Total eclipse begins : instant of first internal tangency of moon with the umbra 食既：月球进入地球本影，并与本影第一次内切。
3.
In a penumbral eclipse , there would only be " moon enters penumbra " , " middle of eclipse " and " moon leaves penumbra " 在月偏食时没有食既和生光，半影月食只有半影食始、食甚和半影食终。
4.
In a penumbral eclipse , there would only be " moon enters penumbra " , " middle of eclipse " and " moon leaves penumbra " 在月偏食时没有食既和生光，半影月食只有半影食始食甚和半影食终。
5.
" total eclipse begins " - when the moon touches the umbra internally , at this time , the moon is totally immersed in the umbra and total eclipse starts 当月球和本影内切时称为食既，这时月球全部进入本影，全食开始月球中心和地影中心距离最近时称为食甚
6.
" total eclipse begins " - when the moon touches the umbra internally , at this time , the moon is totally immersed in the umbra and total eclipse starts 月球同本影接触时称为初亏，这时月偏食开始当月球和本影内切时称为食既，这时月球全部进入本影，全食开始
