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Earth's Rotation & Revolution- Crash Course Kids 8.1

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You've seen the sun set right? And if you get up early enough maybe you've seen it rise too. But have you've ever wondered? If the Sun rises every day and sets every night. Where does it go when we can't see it? Well no where! It's actually us that goes somewhere because we are on the earth, and our planet is always turning or spinning on its axis. Imagine a line passing through the centre of the earth that goes both through the north pole and the south pole. We call the invisible line the axis. Earth spins around on this axis like a top this spinning movement is called the earth's rotation and the earth's rotation is what gives us day and night every day, all year. If you are on the side of the earth that's facing away from the sun as the earth is spinning its night. If you are on the side facing the sun it's you guessed it day! Now, hold on tight because the earth is actually moving in more ways than one. At the same time that the earth's spins on its axis it also orbits or revolves around the sun. This movement is called its revolution. One full orbit all the way around the sun is one revolution and the earth takes 365 days or 1 year to complete a revolution. So have you've got all of this so far? # Now here's the thing, as the earth is both rotating and revolving, its not sitting straight up and down. Its axis is actually tilted just a little, it's not all that much but this tilt causes one part of the earth to lean towards the sun while another part of it is leaning away. This means that different parts of our planets surface gets different amount of sunlight and heat. So why am I telling you all of this? Well as the earth travels around the sun it creates a pattern throughout the year. This pattern happens over and over again and I am sure you've noticed it. At certain times of the year you will see the northern hemisphere leans towards the sun and the southern hemisphere leans away and that other times the southern hemisphere leans towards the sun and the northern hemisphere leans away. That pattern my friend is what makes seasons. When the part of the world that you're living in is leaning towards the sun it's warm and the days are long. Summer. When you're on the part that's leaning away from the sun it's cold and the days are short. Winter. In between its spring or autumn. If the earth weren't tilted we would have the same season all year long. So, revolution, rotation, orbit. Is your head spinning? Let's do a demonstration to shed a little light on these concepts. Okay! You're gonna need a globe and a table lamp without a shade plus a table to put them both on. Put the lamp on the centre of the table and turn it on, put the globe on one side of the table, now hit the lights. The globe is earth makes sense right? The lamp at the centre of the table is the sun at the centre of the solar system. Now slowly spin the globe, as the earth rotates the sun lights up one side of the planet better than the other it's day with the light is shinning more brightly on the globe and night where it's not. Now what's see what the earth's revolution around the sun looks like? Give the globe a few spins with one hand while slowly pushing the globe in a circle around the sun or the lamp with your other hand. So do you notice how the earth keeps rotating as it revolves around the sun? If this were the real sun and earth, by the time you get back to where you started the globe would have completed 365 rotations or days and that's another year gone by. So what is all they show us? It shows that what looks to us to be the motion of the sun in the sky, is really caused by the motion of the earth. So now you know, when you look up and see the sun setting or rising, it's not going around us it's sitting pretty much at the centre of the solar system while we and the 7 other planets go around it. That's sun always gotta be the centre of attention.

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Duration: 4 minutes
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Language: English
License: Dotsub - Standard License
Genre: None
Views: 796
Posted by: schoogle on Feb 2, 2016

Earth's Rotation & Revolution- Crash Course Kids 8.1

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