The seasons are reversed in the Southern hemisphere when compared to the Northern hemisphere because of the tilt of the Earth's axis. The Earth's axis is tilted 23.5 degrees away from perpendicular to the sun. This means that as the Earth orbits around the sun, different parts of the Earth receive different amounts of sunlight and heat. When the Northern hemisphere is tilted toward the sun, it receives more direct sunlight and heat, and experiences summer. At the same time, the Southern hemisphere is tilted away from the sun, and receives less direct sunlight and heat, and experiences winter. The opposite happens when the Northern hemisphere is tilted away from the sun and the Southern hemisphere is tilted toward it. The seasons change depending on which part of the Earth is closer to or farther from the sun.
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