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The Earth has seasons because it is tilted about 23.5 degrees from straight up and down. Think of the Earth as a spinning top, tipped over to one side. It remains tipped in the same direction as it travels around the Sun. This means that sometimes the northern hemisphere of the Earth is pointing towards the Sun, and sometimes it is pointing away. When the northern half of the Earth is pointing towards the Sun, the northern hemisphere of the Earth gets more direct sunlight. We call this the "summer" season for the north. At this same time, the southern half of the Earth is pointed away from the Sun, so people in the Southern Hemisphere get less direct sunlight. We call this "winter" for the southern hemisphere. So, because of the tilt of the Earth's axis, the seasons in the south are the opposite of those in the north. _-Bakonawa-_

The seasons occur because the earth rotates about its axis at and angle of 23.5 degrees (there is a wobble that affects this tilt, but it takes thousands of years).

Since we are at an angle to the suns rays we receive more or less direct light during different times of the year.

In the northern hemisphere, during the summer, we are angled towards the sun during the day, receiving more of the direct solar energy.

In the winter we are angled away from the sun during the day, the sunshine is spread more thinly over the land and we receive less energy.

the southern hemisphere has its summer during the north's winter and vice versa.

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