Final answer:
When the Moon passes through Earth's shadow, it is called a lunar eclipse. A lunar eclipse is visible to everyone on the night side of Earth where the Moon is visible, unlike a solar eclipse which occurs when the Moon casts its shadow on Earth.
Step-by-step explanation:
When the Moon passes through Earth's shadow, this is called a lunar eclipse. This event occurs when the Moon enters the shadow of Earth, making the Moon appear darkened to viewers on the night side of Earth. Unlike a solar eclipse, a lunar eclipse is visible wherever the Moon is above the horizon during the eclipse.
A solar eclipse happens when the Moon moves between the Sun and Earth, casting the Moon's shadow upon Earth's surface. The geometry of a lunar eclipse demonstrates the size of Earth's shadow and how the Moon moves through the different parts of this shadow.