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- Today, I will tell you all about why there are seasons on Earth. Well, it's because the Earth is tilted! Specifically at a 23.5-degree angle. This causes some parts of the planet to receive more direct sunlight than other parts of the planet at different times. Take summertime in the Northern hemisphere for example. At this time of the year, the Earth is tilted towards the sun, therefore the Norther hemisphere receives sunlight at a much smaller angle than the Southern hemisphere. The more concentrated light heats up the ground more effectively than scattered sunlight, so it is warmer in the Northern hemisphere. However, direct sunlight isn't the only reason why summer is warmer. It is also because during the summertime, we get longer days. Since the Earth is tilted towards the sun, the Northern hemisphere sees light for longer, causing the days to be longer. Longer daytime means the sunlight has more time to heat up the ground. More direct sunlight combined with longer daytimes creates summer. The Earth's tilt is always pointed towards the same direction, which means the angle of sunlight and length of days is constantly changing. That also changes the temperature of the planet, creating the seasons.
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- Lastly, I will talk about the area that lies between the Tropic of Cancer and the Tropic of Capricorn. This part the planet only has two seasons, the wet, and the dry. This is because as these areas are close enough to the equator that the tilt of the Earth isn't enough to change the temperatures by so much that there are distinct seasons. Well, that wraps up my explanation of the REASONS FOR SEASONS!
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- But while it is summer in the Northern hemisphere, it is winter in the Southern hemisphere. The is because while the Northern hemisphere is facing more directly at the sun, the Southern hemisphere is pointed more downwards due to the tilt of the Earth. Opposite from the Northern hemisphere, the Southern hemisphere receives sunlight at a larger angle, scattering the light more. The days are also shorter, making it cold in the Southern hemisphere. While we are talking about summer and winter, I should also mention that during the summer in the Northern hemisphere, the sun never sets in the Arctic Circle. This is again, because of the Earth's tilt. The Arctic Circle will rotate in a full circle and the sun will not set. The same phenomenon happens to Antarctica when it is winter in the Northern hemisphere. Now, in between summer and winter, there are the spring and fall equinoxes. This is when the amount of day and night are the same. This happens because the Earth is tilted halfway towards the sun. So the 23.5-degree tilt doesn't affect the lengths of the day. Lastly, I will talk about the area that lies between the Tropic of Cancer and the Tropic of Capricorn.
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