Seasons and the Sun: Crash Course Kids 11.1 - By Crash Course Kids
Transcript
| 00:09 | winter , spring , Summer , fall seasons . I | |
| 00:13 | just love them all . Other than inspiring me to | |
| 00:15 | make up goofy poetry . Why wouldn't you love the | |
| 00:18 | seasons ? There's always something to look forward to . | |
| 00:20 | You already know that summer means long days of fun | |
| 00:23 | in the sun and winter means shorter days , not | |
| 00:25 | to mention building snowmen and making lots of frozen references | |
| 00:29 | . Okay , so clearly the sun and seasons are | |
| 00:31 | linked , but how you already know that the sun | |
| 00:38 | is pretty important . It is the center of the | |
| 00:41 | solar system . After all . You also know that | |
| 00:43 | our planet , Earth revolves around the Sun , making | |
| 00:46 | its orbit once every 365 days . And remember Earth | |
| 00:50 | isn't taking that lap while it's standing straight up and | |
| 00:52 | down . Instead , it's tilted on its axis , | |
| 00:55 | The invisible line around which our planet spins put together | |
| 00:58 | the Earth's tilt on its axis and the orbit it | |
| 01:00 | makes around the sun . And you get the yearly | |
| 01:02 | pattern we call seasons . Let's see how mm since | |
| 01:09 | the earth is tilted for part of the year , | |
| 01:11 | One of the hemispheres , which is half of the | |
| 01:13 | Earth is leaning towards the sun and the other part | |
| 01:16 | of the year . It's leaning away . Let's follow | |
| 01:18 | the northern hemisphere once around the sun to see how | |
| 01:20 | this works in june , the northern hemisphere is tilted | |
| 01:24 | towards the sun . This means that it's getting a | |
| 01:26 | lot of direct sunlight , like that's hitting it straight | |
| 01:28 | on . If you ever sat directly underneath the bulb | |
| 01:31 | , you know that things can get pretty hot and | |
| 01:33 | that's exactly what's happening to the northern hemisphere . It's | |
| 01:36 | summertime and the living is easy temperatures are warm and | |
| 01:39 | days are long in december . Though the northern hemisphere | |
| 01:42 | is tilted away from the sun , its getting indirect | |
| 01:45 | sunlight meaning light is hitting it at an angle indirect | |
| 01:48 | sunlight means cooler temperatures shorter days and for lots of | |
| 01:52 | folks , hot , cocoa and bundling up since it's | |
| 01:55 | winter . But how can the angle of the sun's | |
| 01:57 | light make a difference between hot and cold ? Well | |
| 02:00 | , try this little trick with a flashlight , get | |
| 02:02 | a flashlight and dim the lights in your room a | |
| 02:03 | little bit . If you turn the flashlight on and | |
| 02:06 | pointed straight down onto your desk , you'll see a | |
| 02:08 | small bright , concentrated circle of light . That's kind | |
| 02:11 | of how sunlight hits the Northern hemisphere during the summer | |
| 02:13 | . Bright and intense . Now move the flashlight down | |
| 02:16 | at an angle and pointed at the top of your | |
| 02:18 | desk . See how the light isn't as bright and | |
| 02:20 | is less intense where it falls . That's like the | |
| 02:22 | sunlight we get in winter . But what about spring | |
| 02:24 | and autumn during these two seasons ? The Earth's orbit | |
| 02:27 | causes the Northern Hemisphere to be neither tilted toward the | |
| 02:30 | Sun nor away from it . So temperatures during the | |
| 02:32 | spring and fall or more moderate , not too hot | |
| 02:35 | and not too cold , since the entire globe is | |
| 02:37 | getting about the same amount of direct sunlight at once | |
| 02:40 | . Now , let's take a look at how the | |
| 02:41 | amount of sunlight affects temperatures in the Northern Hemisphere over | |
| 02:44 | the course of a whole year . An easy way | |
| 02:46 | to show this yearly pattern is by using a graph | |
| 02:49 | . This graph shows the average high temperature in each | |
| 02:52 | month for one year . In Toronto Canada , where | |
| 02:54 | I live . Looking at the graph , we see | |
| 02:55 | that during december january and february , when the Northern | |
| 02:58 | hemisphere is getting very little direct sunlight , temperatures are | |
| 03:01 | low and in the months of june july and august | |
| 03:04 | when the tilt of the Earth on its axis is | |
| 03:06 | causing Toronto to get direct sunlight , the temperatures are | |
| 03:08 | much higher , proof positive that something is going on | |
| 03:11 | here and that something is this the season that you're | |
| 03:18 | experiencing , right ? This very minute is caused in | |
| 03:21 | part by the amount of direct sunlight you're getting . | |
| 03:23 | So seasons are caused by the Earth's tilt on its | |
| 03:26 | axis as it cruises around the sun in its orbit | |
| 03:28 | . When one hemisphere gets more direct sunlight , it's | |
| 03:31 | summer , there temperatures are warmer days are longer and | |
| 03:34 | nights are shorter and when it gets more indirect sunlight | |
| 03:37 | , it's winter temperatures are cooler days are shorter and | |
| 03:40 | nights are longer and now , you know what causes | |
| 03:42 | summer , spring , autumn and winter . |
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Seasons and the Sun: Crash Course Kids 11.1 is a free educational video by Crash Course Kids.
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