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day and night
The earth is spherical, so only half of the earth's surface receives sunlight. Daytime is when the earth is exposed to sunlight, and night when it is not. On Earth, day and night are at the same time. This is evidence that the earth is not flat but round.
The Earth's axis of rotation is at an angle of about 23.5˚ to the axis of revolution. Because of this tilt, changes in season occur.