text: An eclipse of the Moon (or lunar eclipse) can only occur at Full Moon, and only if the Moon passes through some portion of the Earth's shadow. \n\n1. Penumbral Lunar Eclipse \n\nThe Moon passes through Earth's penumbral shadow. \nThese events are of only academic interest since they are subtle and quite difficult to observe. \n2. Partial Lunar Eclipse \n\nA portion of the Moon passes through Earth's umbral shadow. \nThese events are easy to see, even with the unaided eye. \n3. Total Lunar Eclipse \n\nThe entire Moon passes through Earth's umbral shadow. \nThese events are quite striking for the vibrant range of colors the Moon can take on during the total phase (i.e. - totality).