On August 1, a total solar eclipse was visible in parts of Canada, northern Greenland, the Arctic, central Russia, Mongolia, and China. The eclipse swept across Earth in a narrow path that begins in Canada's northern territory of Nunavut and ends in northern China's Silk Road region at sunset. An eclipse of the sun occurs when the moon passes directly between Earth and the sun. When the moon's shadow falls on Earth, people within that shadow see the moon block a portion of the sun's light. The moon's shadow has two parts, an umbra and a penumbra. The umbra is the "inner" part of the moon's shadow. The penumbra is the moon's faint "outer" shadow. Credit: Exploratorium and NASA TV sunearthday.gsfc.nasa.gov
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