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.