The only reason we experience seasons at all is axial tilt. The Earth is tilted roughly 23.5 degrees on axis with respect to its orbit. This means that throughout the year, both north and south extremities will experience large variations in solar exposure resulting in seasonal variation. It also means that regions on the equator still experiences some seasonal variation, but to a much lesser degree. Equatorial inhabitants do experience seasonal variation but not nearly to the degree as northern or southern inhabitants.
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