We tell time by them, plan our calendar around them and live with the changes they bring.
Throughout the year, most places on Earth go through four noticeable seasons: summer, autumn, winter and spring, each lasting for about three months.
Seasons are caused because of the Earth's changing relationship to the Sun. The Earth travels around the Sun, in an orbit, that takes 365.24 days. As the Earth travels, its position in relation to the Sun changes and the amount of sunlight each place on the planet gets varies. This change causes the seasons. Seasons are a direct consequence of the Earth's tilted rotation axis, an angle of 23.5 degrees. The direction of the Earth's axis means that during one orbit around the sun, different parts of the Earth leans towards the Sun (summer), while the other leans away (winter). Six months later, the Earth is leaning in the opposite direction
1. New South Wales (12-8)