An eclipse occurs when one celestial body moves into the shadow of another celestial body. The most common types are solar and lunar eclipses. A solar eclipse happens when the Moon passes between the Earth and the Sun, blocking the Sun's light. In contrast, a lunar eclipse occurs when the Earth is positioned between the Sun and the Moon, causing the Earth's shadow to fall on the Moon. Eclipses can be total, partial, or penumbral. A total eclipse means the entire body is obscured, while a partial eclipse means only a part is covered. Penumbral eclipses are subtle, with only a slight shading visible. Eclipses are fascinating astronomical events that can be predicted with precision.