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Periodic climate changes over the course of a year; they are a function of the Earth’s inclination toward the Sun and its rotation around it.

See seasons of the year in : french | spanish

Source of the Earth’s heat.

At the equinoxes, day and night are of equal length; the autumnal (fall) equinox is on September 22 or 23 in the Northern hemisphere.

Season between the autumnal equinox and the winter solstice.

Shortest day of the year; it falls on December 21 or 22 in the Northern hemisphere.

Season between the winter solstice and the vernal equinox.

Season between the summer solstice and the autumnal equinox.

Longest day of the year; it falls on June 21 or 22 in the Northern hemisphere.

Season between the vernal equinox and the summer solstice.

At the equinoxes, day and night are of equal length; the vernal (spring) equinox is on March 20 or 21 in the Northern hemisphere.