Here's why:
* Solar Eclipse: During a solar eclipse, the Moon passes directly between the Sun and the Earth. The Moon's shadow falls on Earth, blocking out the Sun's light completely or partially. This is the only time the Moon is completely blocked from the Sun's rays.
It's important to distinguish between a solar eclipse and a lunar eclipse:
* Lunar Eclipse: During a lunar eclipse, the Earth passes between the Sun and the Moon. The Earth's shadow falls on the Moon, making it appear red or dark. While the Moon is in the Earth's shadow during a lunar eclipse, it is still receiving some sunlight reflected from the Earth's atmosphere.