Lunar eclipse: When the sun the earth and the moon come in a straight line with the earth in between the moon and the sun, then the shadow of the earth falls on the moon This results in a lunar eclipse.
When the Moon is completely in the dark shadow of the Earth is called a total lunar eclipse.
When the Moon is not partly hidden by the dark shadow of the Earth is called a partial lunar eclipse.
A lunar eclipse takes place on a full moon day.
The shadow consists of two parts One part is the darkest part of the shadow where light does not reach from the source of light and this part is known as the umbra.
Another part is not completely dark where some light reaches from the source of light this part is known as the penumbra and it surrounds the umbra.