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Happy Earth's Perihelion Day; When Earth is Closest to the Sun - What? It's Winter!

The Sun as it appeared just a few hours before perihelion 2015, as seen by NASA's Solar Dynamics Observatory. This image is in the far ultraviolet, emphasizing the corona, the star's outer atmosphere. Note the "coronal hole" near the bottom, where the solar wind streams away from the Sun.Photo by NASA / SDO / NASA and writer Phil Plait for Slate magazine, tells us that tonight marks the point where the Earth is closest to the Sun all year and it's called the perihelion. What? But it's Winter time? How can that be? I must have missed my college astronomy class that day, tho I doubt I'm the only one. I know it's the 23.5 degree tilt of the Earth that gives us our seasons, but...

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