The seasons are governed by the tilt of the Earth’s axis in
space as it journeys around the Sun in a year. When the South
Pole of the Earth is tilted towards the Sun, this is our Summer.
Six months later, when the South Pole is tilted away from the
Sun, it's our Winter. In between these we have Autumn and
Spring. Temperatures on our planet are not determined by the
distance of the Earth from the Sun. Rather it is the angle of
the Sun’s rays striking the Earth. In Summer, the Sun is high in
the Sky and the rays hit the Earth at a steep angle. In winter,
the Sun is low in the Sky and the rays strike the Earth at a
shallow angle. The seasons don’t begin on one day and finish on
another. That's because our orbit around the Sun is continuous.
It actually takes quite some time for the Earth to heat up or
cool down, and that’s why the seasons change gradually. In some
parts of the world, such as Australia, seasons begin on the
first day of a particular calendar month - in March for Autumn,
June for Winter, September