When we talk about the different seasons in the southern hemisphere compared with the northern hemisphere we need to start with the sun as this is our big heater and light source in the sky. The earth travels around the sun in space. In fact the sun is 150 million kilometres away from the earth. Yikes!! imagine how hot it would be up close. The earth takes about 365 days to travel once around the sun in what is called its orbit of the sun. This makes up one year and that year is divided into four seasons each of three months and I'm sure we all know what the seasons are don't we. The earth also rotates on itself like a top and each rotation takes about 24 hrs. This gives us night and day. The part of the earth facing the sun has day and the other part in the shade has night. All this activity is making me tired so maybe I should have a good lie down. The earth is about 4.54 Billion years old (that's a lot older than Santa!!) so this has been happening for a long time.
Now here it gets a little complicated so make sure you are concentrating really hard but not so much that your head hurts. The earth is also tilted some 23 degrees from its vertical or upright position. So that at some parts of its travel it is tilted so that the north pole is angled more towards the sun. This gives summer in the northern hemisphere (warmer) and winter (cooler ) in the southern hemisphere. And at other times the reverse is true hence the cold, frosty, snowy winter up north and the hot, sunny summer down under at the same time Amazing !!
A good site to visit for some pictures of all this is ducksters.com
So now I think I will put the fan on for some breeze and have that little nap I mentioned earlier.