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2017 total solar eclipse, SDO image
Moon passing in front of the Sun during the total solar eclipse, 21st August 2017, Solar Dynamics Observatory (SDO) extreme ultraviolet image. Solar eclipses occur when the Moon passes across the Sun as seen from Earth. This eclipse tracked across a narrow portion of the contiguous United States from Lincoln Beach, Oregon, in the north west, to Charleston, South Carolina, in the south east. A partial solar eclipse was visible across the entire North American continent. Solar eclipses usually occur less than once a year, and can only be seen from a small area of the Earth's surface.
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