A composite of six images shows the progression of the annular solar eclipse of May 20, 2012 as viewed from Lassen Volcanic National Park in California. The Moon's distance from Earth varies, and annular solar eclipses occur when the Moon is relatively far from Earth. The Moon appears smaller in the sky and therefore is not able to block the entire Sun. At the peak of this eclipse, the Moon blocked 95 percent of the Sun. This image sequence begins at the top left. The black marks on some of the Sun images are sunspots.
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