Eclipses « Back to Glossary IndexThere are two types of eclipses, solar and lunar. Both of these can occur either partially or in totality. A solar eclipse ocurs when the Sun, Moon and Earth are aligned so that a shadow cast by the Moon falls upon the Earth. A lunar eclipse ocurs when the Sun, Earth and Moon are aligned so that a shadow cast by the Earth falls upon the Moon. Click here to find out more about eclipses at the NASA website Related« Back to Glossary Index