ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Total solar eclipse map, 1851. Diagram showing the ideal regions for viewing the eclipse occurring on 28th July 1851. The line running from upper left to lower right (centre), labelled the 'line of central eclipse', represents the path of the total eclipse. It passes through North America, Greenland, Sweden, central Europe and western Asia. 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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