South It's the revolution of the Earth and the inclination of the Earth's axis that results in seasons. The summer solstice is on the 21st or 22nd of June when the Sun's rays are perpendicular to the Tropic of Cancer, which means that it's summer in the Northern hemisphere and winter in the Southern hemisphere. The winter solstice is the 21st or 22nd of December when the Sun's rays are perpendicular to the tropic of Capricorn which means that it's winter in Northern hemisphere and summer in the Southern hemisphere. The ecliptic's two plans touch in two points of the Earth's orbit. These two points correspond to the equinox and mark the beginning of spring and autumn, respectively on the 21st of March and the 23rd of September.
Night is as long as day during the equinox everywhere in the world.
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