Earth's Seasons

Earth's seasons — winter, spring, summer and autumn(or fall) — are caused by the yearly revolution of the Earth in its orbit around the sun and the planet's tilt. When the Northern Hemisphere is pointed toward the sun, it is summer, and when it is pointed away, it is winter (and vice versa for the Southern Hemisphere). Summer and winter are heralded by their respective solstices, while spring and fall begin at an equinox, when the sun crosses Earth's equator and night day are roughly equal length. Below, our stories that relate to Earth's seasons and the ways they affect us.
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Latest Articles

Five Ways to Prepare Your Pets for Spring
Buddy the dog playing
March 18th, 2014
With the official start to spring only days away, March 20, 2014, soon temperatures will be warming and outdoor activities will return in full force, bringing forth new threats to household pets.
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Behind Sochi: The Science of the Winter Olympics
Shani Davis skating technology
February 12th, 2014
A new video series gives a unique science and engineering perspective on the Olympics.
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Swirling 'Polar Vortex' Over Northern US Seen From Space
Polar Vortex Seen From Space
January 6th, 2014
A whirling onslaught of frigid air, known as a polar vortex, moves menacingly over the northern United States in a new photo from a weather satellite in orbit.
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6 Cool Apps to Cure the Winter Blues
apps, winter blues, cold
March 7th, 2014
It doesn’t take a tropical vacation to give you a little boost.
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'No Pants Subway Ride': Sure It's Fun, But Is It Healthy?
January 10th, 2014
Some daring New Yorkers will be pantless in public this Sunday as part of the annual No Pants Subway Ride. Given the stereotype of public transportation as a conglomerate of germs, might going along with the stunt increase a person's risk of catching an i
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Autumn Equinox: 5 Odd Facts About Fall
The colorful foliage of autumn
September 22nd, 2013
Here's why today marks the start of autumn on the astronomical calendar. From dazzling light shows to hamsters whose testes swell, here are five surprising facts about the season.
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What the Heck Is ... Heat Stroke?
running woman
July 26th, 2013
Can you identify the symptoms of heat stroke?
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Invasive Pests vs. Polar Vortex: Who Will Win?
Emerald ash borer
March 4th, 2014
The sub-freezing temperatures breaking records across the country have one group of observers cheering: biologists, many of whom hope that a polar vortex or two will help slow the northward march of invasive species.
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'Whiteout' Over Great Lakes Seen from Space (Photo)
NOAA's GOES-East satellite captured a Midwestern wintertime "White Out" at 2015 UTC/3:15 p.m. EST on January 6, 2014.
January 8th, 2014
The five Great Lakes, in all their glory, barely peak out from the veil of clouds and whooshing snowfall above them in a new satellite image captured Monday (Jan. 6) as the Arctic's polar vortex barreled southward.
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Fall Foliage Forecast: Vibrant Views in Store for Mid-Atlantic Leaf-Peepers
Fall foliage peak colors in U.S.
September 18th, 2013
This year's most vibrant display of foliage will occur across the mid-Atlantic. Meanwhile, cold air and a dry August have allowed for the early emergence of colors for some areas.
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