In the lunar calendar 15, 16, moon moves to with the solar relative direction. If by now the Earth and moon's center in the identical strip straight line, the moon will enter Earth's umbra approximately, but had the total lunar eclipse. If only then the part moon enters Earth's umbra, produces the partial lunar eclipse. When the Moon enters Earth's half-shadow, should be the half-shadow food, but because its brightness is weaken very much few, is not easy to realize, therefore is not called the lunar eclipse, therefore lunar eclipse only then total lunar eclipse and partial lunar eclipse two kinds. The lunar eclipse is the nature one kind of phenomenon, when the sun, the Earth, the Moon three exactly either move nearly when the identical strip straight line (the Earth between the sun and the Moon), then meets the part the sun to Moon's optical fiber or is covered completely by the Earth, produces the lunar eclipse. The lunar eclipse may divide into the partial lunar eclipse, the total lunar eclipse and the lunar appulse three kinds. When the Moon when the part enters Earth's umbra, will present the partial lunar eclipse; But when the entire Moon enters Earth's umbra, will present the total lunar eclipse. As for the lunar appulse, was refers to Moon only to pass over gently and swiftly Earth's half-shadow region, created month surface brightness extremely slight weakening, saw the difference very difficultly with the naked eye, therefore did not pay attention for the people.
In the 15th and 16th, the moon and the sun moves the opposite direction. Then if the earth and the moon center approximately the same line, and the moon will enter the earth's them, and produce total lunar eclipse. If only part of the moon into earth's them, it produces half days. When the moon into earth's penumbra, should be penumbra food, but because of its brightness abate very little, be aware of not easily, so not called the eclipse, so the eclipse only total lunar eclipse and half days two kinds. An eclipse of the moon is nature's a phenomenon, when the sun, the earth and the moon just or almost three runs in the same line (earth between the sun and the moon), the sun to the moon light will be partly or completely cover the earth, creating an eclipse of the moon.
An eclipse of the moon can be divided into half days, the total lunar eclipse, and penumbra eclipse 3 kinds. When the moon is only partially into earth's them, can appear half days, And when the entire moon into earth's them, will appear total lunar eclipse. As for penumbra eclipse, refers to the moon just over the earth penumbra area, causing lunar surface brightness the slightest abate, it is difficult to tell the difference with the naked eye, so don't in the public eye.