Partial eclipse: The Moon covers only part of the Sun.
Total eclipse: The Moon covers the entire disk of the Sun along a narrow path across the Earth.
Annular eclipse: The Moon is too far from Earth to completely cover the Sun. A thin ring of the Sun's disk surrounds the Moon.
I like that "not to scale" caveat.
Two things I learned from the article: 1. The moon's shadow gets wider and then narrower as it travels across the earth's surface. That never occurred to me and I don't remember anyone saying that. And 2. Eclipses happen about once every year and a half.
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