Seasons On Earth
We have spring, summer, autumn and winter on earth. Every year we go through each of these and they just continue. We have spring and then summer and then autumn and then winter, the next spring etc. These are yearly occurrences; some places on earth are more extreme, and some are less extreme, but there is always some change in the season, no matter where you live. What are the seasons and how do they come about? How is it that we get the seasons on earth?
Reason For Changes In Seasons On Earth
We know that earth is spinning on its own axis and it spins once every day. So this is one thing the earth is spinning in space on its own axis and it just goes on and each day is one spin, that's how we count a day. Earth also revolves around the Sun in its orbit. So the earth spins on its own axis once each day and it revolves around the sun in its orbit the Sun and completes one rotation each year. Now there are 365 spins that take place in one rotation around the Sun which means 365 spins in one rotation around Sun. That's how we get the days and years and why we have 365 days.
As the Sun is much larger than the earth and is a source of heat and light in relationship to the earth. The distance bet is 93 million miles and we know that light travels at a very fast speed but the earth still is so far away from the sun that the light leaving the Sun takes eight minutes even at its superfast speed to get to the earth. So if there is something happening to the Sun it goes blip we don't see it after eight minutes. Now we've got 365 spins, we've got one orbit around the Sun and that's one year.
Now the thing about the Sun, the earth is spinning and when you've probably seen the Sun go down right or you've seen the moon come up and well it's kind of slow if you look a little later and you will see it's moved little then you come back a little you will see it's moved a little bit further, it seems awfully slow. The fact of the matter is the earth is spinning at about a thousand miles an hour (1600 km/hr) so if you standing on earth right now, sometime later, even though you're just standing still you're traveling a thousand miles an hour.
Even though it's such a big world that's spinning and also revolve around and because of that spin it just always stays steady, even though it revolves around the sun. This is where we come to the reason for the seasons. The earth in relation to the Sun is not exactly lined up to where the middle of the earth is directly across from the middle of the Sun, it's actually tilted. This is why when you ever use look at a globe they're at an angle because that angle is the true angle in relationship to the Sun. So if you set a globe on a table that angle is the relationship to the Sun and because the earth is spinning that angle always stays the same, no matter where it is in its orbit, it's always the same. So year by year by year that angle stays the same and that's what causes the seasons.
As Sun is full of light and heat, a lot of radiation when the Sun is pointed at any part of the earth while spinning as well as rotating around the sun, that part of the earth gets the most direct light from the Sun to the earth and the most direct radiation creates the most heat and it's a most warmer. Its opposite part gets less direct light, less heat and it's cooler it's just because of that angle and it's always the same. So as the earth rotates if we've got any part of the world gets direct light and heat from the sun then the part which is above the line on the globe in this relationship to the Sun is hotter and the part of the world below the line is a bit cooler and it isn't a tremendous amount of difference but it's enough to make it summer on above part and winter down.
Now as the world is spinning and it's rotating around the Sun you get the earth is on the other side of the Sun and remember we still have the same tilt. Now what happens, let us look at the southern part of the world below this line is getting the more direct sunlight the more direct radiation and the northern part is getting a little bit less direct radiation. So it's going to be at this point in the orbit around the Sun that the southern part of the world is warmer than the northern part of the world. So you have times of the year where it's warmer and then cooler, so let's come back here we have summer in England while rotation when England is in the first side here, 's summer in England. Now while rotating around the sun when the earth goes to another side of the sun at this same point there is the winter in England, it's pretty cold compared to South Africa where it's hot. During the winter season, it's cooler so that is what is it the basis of all the seasons on earth.