A season is one of the four divisions of the year. In general, the season refers to annual climate change. In temperate areas there are four seasons: spring, summer, autumn and winter, and in areas with tropical-wet climate they are: the rainy season and the dry season.
The seasons are determined by the tilt of the Earth's axis combined with its rotation in orbit around the Sun. Astronomically, the seasons last during periods between which the Earth passes through certain points of orbit, a fact seen from Earth as the passage of the Sun through solstices and equinoxes.
The alternation of seasons in the northern hemisphere.
In the revolution movement, the Earth discovers four positions towards the Sun (corresponding to the four seasons):
Winter: on December 22, the sun's rays fall perpendicular to the Tropic of Capricorn in the Southern Hemisphere. This day is called the Winter Solstice, when we have the longest night and shortest day.
Spring: March 21 is the astronomical spring, when the sun's rays fall perpendicular to the equator and heat the two hemispheres evenly. The difference is that in the Northern Hemisphere it is spring, and in the Southern Hemisphere it is autumn. This day is called the Spring Equinox, when the day is equal to the night.
Summer: on 22 June, the sun's rays fall perpendicular to the Tropic of Cancer in the Northern Hemisphere, representing the summer season, and the day is called the Summer Solstice with the longest day and shortest night.
Autumn: On September 23, the Sun's rays fall perpendicular to the equator and heat the two hemispheres evenly. The difference is that in the Northern Hemisphere it is autumn, and in the Southern Hemisphere it is spring. This day is called the Autumn Equinox, when the day is equal to the night.
