Sun

The star at the heart of our solar system

Totality

The duration of total obstruction during the eclipse

Lunar Eclipse

An eclipse where the moon appears darkened from the Earth's shadow

Umbra

A shadow cast over an area experiencing a total eclipse

Earth

A rocky terrestrial planet

Universe

All the space and all the matter and energy that space contains

Penumbra

A shadow cast over an area experiencing a partial eclipse

Solar Eclipse

An eclipse where the sun is blocked by the moon

Moon

The biggest and brightest object in our night sky

Corona

A glow from the sun seen surrounding the moon during a total eclipse