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lunar eclipse 
Eclipse during which the Moon enters Earth’s umbra shadow in part or in full.
Sun
Light source eclipsed by Earth.
Moon’s orbit
Elliptical path of the Moon revolving around Earth under the effect of gravitation.
Earth’s orbit
Elliptical path of Earth revolving around the Sun under the effect of gravitation.
umbra shadow
When the Moon is completely in this region, the Sun’s light no longer reaches it; the eclipse is therefore total.
Moon
Natural satellite of Earth.
penumbra shadow
When the Moon enters this region, it slowly ceases to be illuminated by the Sun.
Earth
Our planet, by coming between the Sun and the Moon, gives rise to lunar eclipses.
