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Earth's Orbit, Axial Tilt, and the Seasons, Vernal Equinox, 21 March, Earth's spin axis is tilted, relative to the orbital plane, Spring, Northem, Hemisphere |, Summer in North, Hemispher, Winter Solstice, 22 Dec, No Sunlight on Northpole, Winter in N Hemisphere, Summer Solstice, 21 June, Perihelion-, 0.98329 AU, Aphelion – Jul. 4, Tropic of Cancer, Equator, Tropic of Capricorn, Summer in South, 1.01671 AU, No Sunlight on, South Pole, Hemisphere, Winter in South, Hemishphere, Autumnal Equinox, 23 Sept, Fall, Northern, Hemisphere