A lunar Eclipse is the phenomenon when the Moon in its motion falls within the shadow area of the Earth.
At this point, the Moon, Earth and Sun are aligned, and the Earth is blocking the Sun from the moon. That is, a lunar Eclipse always occurs at the full moon.
During the lunar Eclipse on the Earth can be seen partially or completely obscured the moon.
A lunar Eclipse can be observed in half of the Land where at the time of the Eclipse the Moon is above the horizon.
The diameter of the shadow of the Earth 2.5 times the diameter of the moon, so the Earth's shadow can cover the disc of the moon completely. Such an Eclipse is called full. When the Moon is immersed in earth's shadow only partially, talk about private lunar Eclipse.
If the line Sun-Earth-Moon is too far from ideal, phase total Eclipse cannot occur. Or the Earth's shadow can touch only the edge of the lunar disk, and will be only covering the moon's penumbra. Depending on the location of these three heavenly bodies, the duration of the phases of private and total Eclipse may vary. The maximum length of a lunar Eclipse can be 108 minutes.
For the same reasons can be different, the brightness of the disk of the moon during the offensive phase of total Eclipse. It so happens that the moon is not visible at all, and Vice versa, there were cases when outside observers did not believe that there is an Eclipse: so bright was the Moon.
Look again at the first picture: round cone shade of the Earth has a penumbrawhere the Earth obscures the Sun only partially. If the Moon passes the area of the penumbra, but not included in the shadow, is semi-transparent Eclipse. When the brightness of the moon decreases, but only slightly, the reduction in brightness can be recorded only devices.
Even during a total Eclipse, the Moon does not disappear from view completely, and becomes dark red. This is because even in the phase of full Eclipse of the moon continue to Shine the sun's rays, but they are tangent to the earth's surface, are refracted and dispersed in the Earth's atmosphere. The atmosphere of our planet absorbs short-wavelength (blue) end of the spectrum, and red passes freely. These rays reach the surface of the moon during the Eclipse. The nature of this effect is the same as that at the sunset, when the rays of the setting Sun paint the Western part of the sky in delicate pink color.