First 102 words of the document:
A total eclipse occurs when the dark silhouette of the Moon
completely obscures the intensely bright disk of the Sun,
allowing the much fainter solar corona to be visible. During
any one eclipse, totality only occurs at best in a narrow track
on the surface of the Earth.
An annular eclipse occurs when the Sun and Moon are
exactly in line, but the apparent size of the Moon is smaller
than that of the Sun. Hence the Sun appears as a very bright
ring, or annulus, surrounding the outline of the Moon.