ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Total solar eclipse viewing locations, 1851. Diagram predicting the ideal regions for viewing the eclipse occurring on 28th July 1851. The vertical lines represent the path of the eclipse. They are running in a south-westerly direction from top to bottom (from Norway to the Black Sea, across Sweden, Denmark, Germany, Poland and Ukraine), where north is approximately at upper right of the image. A total solar eclipse occurs when the moon passes across the Sun as seen from Earth. Total 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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