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Between the vernal equinox and the autumnal equinox, more than half of the hemisphere is illuminated by the sun, peaking at 63% illumination on the summer solstice. Likewise, between the autumnal equinox and the vernal equinox, less than half of the hemisphere is illuminated by the sun, reaching the minimum of 37% illumination on the winter solstice. As the Earth rotates, you are rotating through more sunlight and less darkness during the spring and summer months, and you are rotating through more darkness and less sunlight during the fall and winter months. Since the speed at which the Earth rotates is constant, you are spending more time in the sunlight in the spring and summer and more time in the darkness in the fall and winter.

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