The seasons are governed because of the tilt in the Earth’s axis in space since it journeys round the Sun each year. When the South Pole with the Earth is tilted for the Sun, this is our Summer. Six months later, once the South Pole is tilted out of the Sun, it's our 1st day of winter 2016. In between these we've got Autumn and Spring.
emperatures on the earth are not determined through the distance from the Earth through the Sun. Rather oahu is the angle in the Sun’s rays showing up in Earth. In Summer, the Sun has elevated levels of the Sky plus the rays hit the Earth in a steep angle. In winter, the Sun is reduced in the Sky plus the rays strike the Earth with a shallow angle.
The seasons don’t begin on a single day and finished on another. That's because our orbit round the Sun is continuous. It actually takes some time now for the Earth to heat or calm down, and that’s why the seasons change gradually and When Does Winter Start?
So when will we actually start the seasons?
In some parts in the world, like Australia, seasons begin about the first day of a selected calendar month - in March for Autumn, June for Winter, September for Spring and December for Summer. In other countries for example Britain, it’s accepted how the seasons begin for the dates that this Earth passes four special points rolling around in its orbit concerning the Sun.
Spring Equinox (AEST)
2014 September 23, 12:29
2015 September 23, 18:20
2016 September 23, 00:21
On the day from the Spring Equinox, the Earth’s poles is the same distance through the Sun. In Melbourne, the Sun rises due east, sets due west and grows to 52° higher than the horizon at noon. On this day you will discover roughly 12 hrs of day and 12 hrs of night.
Summer Solstice (AEDT)
2014 December 22, 10:03
2015 December 22, 15:48
2016 December 21, 21:44
The Sun in summer
Artist: Frey Micklethwait. Source: Museum Victoria.
On manufactured of Summer Solstice, the Earth’s south pole is tilted towards Sun. The Sun rises south of east, sets south of west and reaches 75 1/2° across the horizon at noon. This is, usually, the longest day in the year.
Autumn Equinox (AEDT)
2014 March 21, 03:57
2015 March 21, 09:45
2016 March 20, 15:30
On the day in the Autumn fall equinox 2016, the Earth’s poles are similar distance through the Sun. The Sun rises due east, sets due west and reaches 52° over the horizon at noon. There are roughly 12 hrs of day and 12 hrs of night.
Winter Solstice (AEST)
2014 June 21, 20:51
2015 June 22, 02:38
2016 June 21, 08:34