umbra

In this case, about 3.5% of the moon will appear darkened by the Earth’s umbra, a term that describes the darkest segment of the Earth’s shadow.

The lighter one, called the penumbra, will not have too much effect but the umbra, the inner and darker shadow, will darken the Moon.

In the umbra of these darkly tinged stories, readers will experience late-night fears and the sweet relief of daylight.

“Having once stood in the umbra, the Moon’s shadow, during a solar eclipse, we are driven to do so again and again, whenever the Moon moves between the Earth and the Sun.”

A solar eclipse occurs when a new moon aligns perfectly between Earth and the sun and briefly casts a shadow on our planet, called an umbra.