why do we have four seasons on earth
Many people think that some parts of the year are hotter because we're nearer to the Sun, but the real reason is that
the Earth is wonky (tilted). Why do we have seasons? We have seasons because the earth is tilted (wonky) as it makes its yearly journey around the sun. The Earth's tilt The Earth's axis is tilted at an angle of 23. 5 degrees. This means that the Earth is always pointing to one side as it goes around the Sun. So, sometimes the Sun is in the direction that the Earth is pointing, but not at other times. The varying amounts of sunlight around the Earth during the year, creates the seasons. The tilt of the Earth's AXIS is the most important reason why seasons occur. We have hot summers and cold winters because of the tilt of the Earth's axis. The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later. In between these, Spring and Autumn will occur. The Earth revolves around the Sun. The North pole always points the same way as the Earth revolves around the Sun. The Earth's movement around the sun causes the seasons. The Earth takes 365. 24 days to orbit the sun. As we move around the Sun during the year, the amount of light each area of the planet receives varies in length. When the Earth's axis points towards the Sun, it is summer for that hemisphere.
When the Earth's axis points away, winter can be expected. It is Summer time in countries in the Northern Hemisphere. It is Winter time in countries in the Southern Hemisphere. It is Winter time in countries in the Northern Hemisphere. It is Summer time in countries in the Southern Hemisphere. Since the tilt of the axis is 23 1/2 degrees, the north pole never points directly at the Sun. The north pole begins to move away from the Sun. The Sun rises lower in the sky so the days start getting shorter. When the Sun is at its mid-point in the sky, we reach the ' ', around 22 September. Day and night are both 12 hours long and its the beginning of autumn. The Earth continues on its path, and our north pole starts moving towards the Sun again. The Sun moves upwards in our skies and the days continue getting longer. Again, we reach a midpoint when day and night are both 12 hours long. This is called the ' ' and happens around 21 March. Did you know? The Earth's movement around the sun causes the seasons, but it does not affect the temperatures during the seasons. Many people believe that the temperature changes because the Earth is closer to the sun in summer and farther from the sun in winter. In fact, the Earth is farthest from the sun in July and is closest to the sun at the beginning of January!
The height of the sun in the sky varies with the seasons. The sun is at its heighest at 12:00pm (noon) on any gven day. In the summer the sun is higher than it is in the other three seasons. Summer Months Summer is warmer and winter is colder because of the length of our days and nights. In the summer daylight lasts longer and night time is shorter. Winter Months In winter the days are shorter and the nights longer. There is more time for the sun to warm us during long summer days. And short winter days have long, cold nights. Revolution - The Earth revolves around the Sun. As nice as summer is, we really need the other seasons as well. Why do we have seasons? We all know that the world turning makes day and night. In 24 hours the world turns round once. When we are facing the Sun it is day. When we face away it is night. Simple! We travel around the Sun in a circle, so why does it get colder in the winter? It's because the spin of the Earth is actually wonky. The axis of the Earth is tilted, which means that in summer we (in the UK) are leaning towards the Sun. As we travel around the Sun, we begin to tilt away and it becomes winter. Have a look at this clip to see how the Earth's tilt changes the seasons.
This is why when we have winter, Australia has summer. Imagine having Christmas dinner on the beach! But not all countries have seasons. Countries near to the equator - the line which goes round the middle of the earth - have very mild seasons. The weather stays almost the same temperature all the year round. Can you think why this is? The middle doesn't tilt very much does it? This means the seasons don't change as much. Can you guess what the seasons are like in the North and South Pole? Because they tip further towards and further away from the sun, their seasons are very extreme. The North and South Pole only have one sunrise and one sunset a year. It is dark for six months of the year and light for six months of the year. What problems would there be if you had to live somewhere that was dark for six months of the year and light for six months of the year? The sun seems to move across the sky during the day because the Earth is spinning. The stars do exactly the same thing. They seem to move a across the sky at night. We can photograph it happening. Or view in The stars seem to trail out into long curved lines. Can you see which the pole star is? This the one hardly moves at all because it is right above the North Pole of the earth.
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