Why is it summer in the northern hemisphere when it is winter in the southern hemisphere?

Answer 1

In short, it's because of the tilt of the earth in relation to its poles.

Because of the tilt of the earth with respect to its poles, half of the earth is always closer to the sun than the other. Winter occurs because the half of the earth that faces the sun faces away from it, while the other half faces it, experiencing summer.

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Answer 2

Owen Atkinson

Different seasons are experienced by the northern and southern hemispheres of the Earth due to variations in the distribution of sunlight caused by the tilt of the Earth's axis. The northern hemisphere experiences summer when it is tilted towards the Sun, while the southern hemisphere experiences winter when it is tilted away from the Sun.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.