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While it is true that Earth does have a perihelion, or point at which it is closest to the sun, and an aphelion, its farthest point from the sun, the difference between these distances is too minimal as to have any significant impact on the Earth's seasons and climate.
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ecology.com/features/tiltingearth/
ecology.com/features/tiltingearth/
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It is this inclination of the Earth's axis of rotation that is the reason for the seasons. The earth maintains the same angle of inclination throughout its orbit. Another way of saying this is that the earth’s axis is parallel to itself at all points in its orbit.
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daphne.palomar.edu/jthorngren/tutorial.htm
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A description of the seasons, and common misconceptions about what causes them. ... It is the relative location of the Sun with respect to this constant tilt angle that causes the seasons, not some elaborate square dance of the Earth bowing to its partner as it moves around its orbit!
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csep10.phys.utk.edu/astr161/lect/time/seasons.html
csep10.phys.utk.edu/astr161/lect/time/seasons.html
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What is it that causes the change in seasons? ... Earth's tilt affects seasons. In this graphic, distances and sizes are not to scale. ... This montage of satellite imagery shows how vegetation changes on Earth with the seasons.
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www.msnbc.msn.com/id/3077384/
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This interactive activity from the Adler Planetarium explains the "reasons for the seasons." Featured is a game in which Earth must be properly placed in its orbit in order to send Max, the host, to different parts of the world during particular seasons. ... To learn more about the effect of seasons on Earth,
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www.teachersdomain.org/resource/ess05.sci.ess.eiu.seaso...
www.teachersdomain.org/resource/ess05.sci.ess.eiu.seasonsgame/
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USATODAY.com Latest News ... The reason for changes in Earth's seasons is the Earth's tilt, not its distance from the sun. ... In fact, the Earth's average temperature is actually higher in July, when it's the farthest from the sun.
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www.usatoday.com/weather/tg/wseason/wseason.htm
www.usatoday.com/weather/tg/wseason/wseason.htm
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During the year, the seasons change depending on the amount of sunlight reaching the Earth as it revolves around the Sun. ... The seasons are caused as the Earth, tilted on its axis, travels in a loop around the Sun each year.
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www.windows.ucar.edu/tour/link=/earth/climate/cli_seaso...
www.windows.ucar.edu/tour/link=/earth/climate/cli_seasons.html
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Biosphere 2 is a center for research, outreach, teaching, and life-long learning about Earth and its living systems. ... It's one thing to build high-tech energy-and-water efficient homes. It's another to build them affordably for lower-income families. ... UA Awarded $4.35M to Study Earth's Critical Zone...
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The Earth's orbit is very close to being a perfect circle, but not quite. It is somewhat elliptical, which means that the distance between the Earth and the Sun varies over the course of the year. This effect is too weak to cause the seasons, but it might have some influence over their severity.
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aa.usno.navy.mil/faq/docs/seasons_orbit.php
aa.usno.navy.mil/faq/docs/seasons_orbit.php
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