An eclipse occurs when the shadow of a planet or moon falls upon another planet or moon.
An eclipse of the Sun occurs when the shadow of the Moon falls upon the Earth.
A total eclipse of the Sun occurs when the Moon passes immediately in front of the Sun and appears to cover it completely.
During a total eclipse, the Sun's corona becomes visible.
A total solar eclipse can only been seen within a narrow "corridor" on the Earth's surface.
Those observing from outside the "corridor" see a partial solar eclipse
An annular eclipse occurs when the moon is too far from the Earth to completely cover the Sun.
An eclipse of the Moon occurs when the shadow of the Earth falls upon the Moon.