Science 18

As celestrial bodies revolve around one another, their orbits may sometime align in a way that causes the shadow of one body to completely eclipse that of another. During an eclipse, the overshadowed body is not visible from Earth.

solar eclipse occurs when the moon passes between the sun and the Earth so that the sun is partially or completely blocked. A lunar eclipse occurs when the moon moves into the shadow of the Earth.

Figure 1 shows a diagram of the Earth, moon and sun at various positions, labeled A-D.