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Imagine that you live in North America. And one day you call up your friend in Australia. You guys are talking, and you make plans to go visit him next summer. So anytime next summer works for you? Yeah, whenever is best for you. Surprise me. In a few months, July rolls around, and you hop on a plane for your Australian vacation. Imagine your surprise when you show up at his house, and he tells you-- What are you doing here mate? It's the middle of winter. And then you say-- Winter? It's the middle of summer back in America. And your friend's like-- I don't know what to tell you. July is winter for us. OK, I don't get this. How can it be summer in America and winter in Australia at the same time? That's a great question. I think we can help you out with that. To answer this question, we have to zoom way back and start with a top-down look at the Earth's orbit around the sun. Oh, by the way, everything you see in this video isn't to the correct scale. Now, the Earth's orbit isn't a perfect circle. It's actually an ellipse. You usually see it drawn like this. Lots of people think-- Hey, this must be by we have seasons. When the Earth is close to the Sun, we have summer, and when the Earth is far away from the Sun, we have winter. But that's actually not true. [BUZZER] If that were true, it would be summer in America and Australia at the same time. And we know that's not the case. Exactly. The way we've drawn Earth's orbit here is really exaggerated. People just draw it that way to highlight the extreme. In actuality, there's a relatively small difference between the Earth's closest and furthest points from the Sun. If we draw Earth's orbit with the correct shape, it looks like this. You can see it's actually pretty circular, but it's not perfect. So it's not the closeness of the Earth to the Sun that causes the seasons. To see what's actually at work, we have to look that the orbit from the side. In our side view, the Earth is revolving around the Sun in this orbital plain here. It takes one year to go through a full orbit, 365 days. Remember, at the same time Earth is rotating on its axis once every day. The important thing, for the seasons at least, is that the Earth actually isn't straight up and down. It's tilted at an angle of 23.5 degrees. So when the Earth is on this side of the Sun, the Northern Hemisphere is angled away from the Sun. The Southern Hemisphere is angled toward the Sun. When the Earth is revolving around the Sun, it stays tilted in the same position. The axis doesn't wiggle around or anything. It just stays fixed in a certain direction. So when the Earth is over here, the Northern Hemisphere is angled towards the Sun, and the Southern Hemisphere is angled away. When a hemisphere is angled towards the Sun, the Sun's rays hit it directly. That's what's happening in the Northern Hemisphere here. But when a hemisphere is angled away from the Sun, like the Southern Hemisphere here, the Sun's rays hit it indirectly. OK, so what...
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