Earth's Rotation & Revolution: Crash Course Kids 8.1 - By Crash Course Kids
Transcript
| 00:09 | you've seen the sunset , right ? And if you | |
| 00:11 | get up early enough maybe you've seen it rise to | |
| 00:13 | . But have you ever wondered if the sun rises | |
| 00:15 | every day and sets every night ? Where does it | |
| 00:18 | go when we can't see it ? Well no where | |
| 00:25 | it's actually us that goes somewhere because we're on the | |
| 00:28 | Earth and our planet is always turning or spinning on | |
| 00:31 | its axis . Imagine a line passing through the center | |
| 00:33 | of the earth that goes both through the north pole | |
| 00:35 | and the south pole . We call that invisible line | |
| 00:38 | the axis Earth spins around on this axis like a | |
| 00:41 | top . This spinning movement is called the Earth's rotation | |
| 00:44 | and the Earth's rotation is what gives us day and | |
| 00:46 | night every day , all year . If you're on | |
| 00:49 | the side of the earth that's facing away from the | |
| 00:51 | sun as the Earth is spinning it's night . If | |
| 00:53 | you're on the side facing the sun it's you guessed | |
| 00:56 | it day now hold on tight because the Earth is | |
| 00:59 | actually moving in more ways than one at the same | |
| 01:01 | time that the earth spins on its axis . It | |
| 01:04 | also orbits or revolves around the sun . This movement | |
| 01:08 | is called its revolution wonderful orbit . All the way | |
| 01:10 | around the sun is one revolution and the Earth takes | |
| 01:13 | 365 days or one year to complete a revolution . | |
| 01:17 | So have you got all of this so far ? | |
| 01:18 | The Earth is rotating on its axis , creating day | |
| 01:21 | and night and the same time it's revolving all the | |
| 01:24 | way around the sun . Now here's the thing as | |
| 01:26 | the Earth is both rotating and revolving , it's not | |
| 01:29 | sitting straight up and down . Its axis is actually | |
| 01:32 | tilted just a little . It's not all that much | |
| 01:34 | , but this tilt causes one part of the Earth | |
| 01:36 | to lean towards the sun while another part of it | |
| 01:38 | is leaning away . This means that different parts of | |
| 01:41 | our planet surface gets different amounts of sunlight and heat | |
| 01:44 | . So why am I telling you all of this | |
| 01:46 | ? Well as the Earth travels around the sun , | |
| 01:48 | it creates a pattern throughout the year . This pattern | |
| 01:51 | happens over and over again and I'm sure you've noticed | |
| 01:54 | it at certain times of the year . You see | |
| 01:56 | the northern hemisphere leans towards the sun and the southern | |
| 01:58 | hemisphere leans away and at other times the southern hemisphere | |
| 02:01 | leans towards the sun and the northern hemisphere leans away | |
| 02:04 | that pattern , my friend , is what makes seasons | |
| 02:07 | when the part of the world that you're living in | |
| 02:09 | is leaning towards the sun . It's warm and the | |
| 02:11 | days are long summer when you're on the part that's | |
| 02:14 | leaning away from the sun , it's cold and the | |
| 02:16 | days are short winter in between its spring or autumn | |
| 02:20 | . If the Earth weren't tilted , we would have | |
| 02:22 | the same season all year long . So revolution , | |
| 02:26 | rotation orbit is your head spinning ? Let's do a | |
| 02:29 | demonstration to shed a little light on these concepts . | |
| 02:34 | Mm Okay , you're gonna need a globe in a | |
| 02:37 | table lamp without a shade plus a table to put | |
| 02:40 | them both on . Put the lamp in the center | |
| 02:42 | of the table and turn it on . Put the | |
| 02:43 | globe on one side of the table now hit the | |
| 02:45 | lights . The globe is Earth makes sense Right ? | |
| 02:48 | The lamp at the center of the table is the | |
| 02:50 | sun at the center of the solar system . Now | |
| 02:52 | slowly spin the globe as the Earth rotates , the | |
| 02:54 | sun lights up one side of the planet better than | |
| 02:56 | the other . It's day where the light is shining | |
| 02:58 | more brightly on the globe and night where it's not | |
| 03:00 | . Now , let's see what the Earth's revolution around | |
| 03:02 | the sun looks like . Give the globe a few | |
| 03:05 | spins with one hand while slowly pushing the globe in | |
| 03:07 | a circle around the sun or the lamp with your | |
| 03:10 | other hand . So do you notice how the earth | |
| 03:12 | keeps rotating as it revolves around the sun ? If | |
| 03:14 | this were the real sun and Earth , by the | |
| 03:16 | time you get back to where you started , the | |
| 03:18 | globe would have completed 365 rotations or days and that's | |
| 03:22 | another year gone by . So what does all this | |
| 03:24 | show us ? It shows that what looks to us | |
| 03:31 | to be the motion of the sun in the sky | |
| 03:32 | is really caused by the motion of the Earth . | |
| 03:35 | So now , you know , when you look up | |
| 03:37 | and see the sun setting or rising , it's not | |
| 03:39 | going around us , it's sitting pretty much at the | |
| 03:41 | center of the solar system while we and the seven | |
| 03:44 | other planets go around it , that son always got | |
| 03:47 | to be the center of attention . |
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