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happens last this evening, on Tuesday, January 1, at 11:00 p.m. CST.
• The word "perihelion" is from the Greek words peri meaning near, and helios meaning sun.
• Earth is closest to the sun every year in early January, when it's winter for the Northern Hemisphere. We're farthest away from the sun in early July, during our Northern Hemisphere summer. So you can see that Earth's distance from the sun isn't what causes the seasons. On Earth, it's mostly the tilt of our world's axis that creates winter and summer. In winter, your part of Earth is tilted away from the sun. In summer, your part of Earth is tilted toward the sun. The day of maximum tilt toward or away from the sun is the December or June solstice.
• Are the December solstice and January perihelion related?
• Earth is about 5 million kilometers - or 3 million miles - closer to the sun in early January than it will be in early July. That's not a huge change in distance. It's not enough of a change to cause the seasons on Earth.
• Though not responsible for the seasons, Earth's closest and farthest points to the sun do affect the lengths of the seasons. When the Earth comes closest to the sun for the year, as now, our world is moving fastest in orbit around the sun. Earth is rushing along now at 30.3 kilometers per second (almost 19 miles per second) - moving about a kilometer per second faster than when Earth is farthest from the sun in early July. Thus the Northern Hemisphere winter (Southern Hemisphere summer) is the shortest season as Earth rushes from the winter solstice in December to the (Continued on page 14)
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