This occurs when the Earth's shadow is cast onto the Moon. It will happen at the time of the full moon, and will be visible from the entire night-side of the Earth.

During an umbral eclipse, when all or part of the Moon passes through the darker central cone of shadow (equivalent to a total solar eclipse) the affected portion may be coloured anything from almost black through deep red to pale orange.

In a penumbral eclipse, the Moon enters the lighter outer shadow (corresponding to a partial solar eclipse). This will generally be a pale amber or yellow colour.