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Earth reaches perihelion - its closest approach to the Sun - at 1:37 am EST on January 4. The Earth is then 91,401,600 miles (147,104,780 km) from our star. The winter in the Northern Hemisphere and the summer in the Southern Hemisphere are caused by the Earth's tilt on its axis, not by its distance from the Sun. [Source: CFA (Harvard-Smithsonian Center for Astrophysics)]
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