| 1. | As it circles our planet , the changing position of the moon with respect to the sun causes our natural satellite to cycle through a series of phases : new , new crescent , first quarter , waxing gibbous , full , waning gibbous , last quarter , old crescent and back to new again
当月球进入地球的半影时，应该是半影食，但由于它的亮度减弱得很少，不易察觉，故不称为月食，所以月食只有月全食和月偏食两种。 |
