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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Is Spring Near? Punxsutawney Phil Doesn't See His Shadow
groundhog-phil-02
February 2nd, 2016
Early this morning, the Punxsutawney Phil signaled that spring is near as he saw his shadow in his 130th prediction. How often does he get it right?
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Polar Vortex to Deliver Arctic Blast to Parts of US
US Forecast midweek Jan 5 2016
January 5th, 2016
A glancing blow from the polar vortex will direct cold air southward and could raise the chance of snow in the central and eastern United States toward the middle of January.
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Groundhogs on the Menu? The Wild History of Punxsutawney Phil
Punxsutawney Phil, the weather-predicting groundhog.
February 1st, 2016
Punxsutawney Phil may not know it, but groundhogs were part of the menu on Groundhog Day in the late 1800s.
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Solstice Science: How Humans Celebrate Official Start of Summer
Summer Sun
June 20th, 2015
This Sunday (June 21) marks the summer solstice, the official start of summer in the Northern Hemisphere.
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Spring Colors Swirl in Picturesque North Atlantic
Plankton in northwest Atlantic Ocean
May 27th, 2015
A new NASA image hints at the complex factors that encourage giant plankton blooms in the North Atlantic.
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A Hurricane? In January? You Can Thank El Niño
hurricane joaquin
January 12th, 2016
Hurricane Pali is the earliest ever recorded hurricane in the Central Pacific, a rare winter tropical cyclone that benefited from a strong El Niño.
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The Mystery of Why Urinary Tract Infections Peak in Summer
artist rendering of bacteria
October 27th, 2015
Severe urinary tract infections spike in the summertime, especially among younger women, a new study finds.
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