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3 Seasons and the Sun- Crash Course Kids 11.1

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Other than inspiring me to make up goofy poetry, why wouldn't you love the seasons. There's always something to look forward to. You already know that summer means long days of fun in the sun and winter means shorter days, not to mention building snowman and making lots of frozen references. OK! So clearly the sun and seasons are linked. But how? You already know that the Sun is pretty important It is at the center of the solar system after all. You also know that our planet Earth revolves around the Sun making its orbit once every 365 days. And remember, Earth isn't taking that lap while it standing straight up and down. Instead, it's tilted on its axis, the invisible line around which a planet spins. Put together, the Earth's tilt on its axis and the orbit it makes around the Sun and you get the yearly pattern we call - seasons. Let's see how! Since the Earth is tilted, for part of the year one of the hemisphere which is half of the Earth is leaning toward the Sun and the other part of the year it's leaning away. Let's follow the northern hemisphere once around the Sun to see how this works. In June, the Northern Hemisphere is tilted towards the sun, this means that it's getting a lot of direct sunlight like that's hitting it straight on. If you have ever sat directly underneath the bulb you know that things can get pretty hot and that's exactly what's happening to the Northern Hemisphere. Its summer time and the living is easy temperatures are warm and days are long. In December, though the Northern Hemisphere is tilted away from the Sun, its getting indirect sunlight, meaning light is hitting it at an angle. Indirect sunlight means cooler temperature, shorter days and for lots of folks, hot cocoa bunting up since its winter! But how can the angle of the Sun's light make a difference between hot and cold? Well, try this little trick with a flashlight. Get a flashlight and dim the lights in your room a little bit if you turn the flash light on and put it straight down on to your desk, you will see a small bright concentrated circle of light. That's kind how sunlight hits the Northern Hemisphere during the summer- bright and intense. Now move the flashlight down at an angle and point it on to the top of the desk see that the light isn't as bright and is less intense where it falls, that's like the Sun we get in winter but what about spring and autumn? During these two seasons, the Earth's orbit causes the Northern Hemisphere to be neither tilted toward the Sun nor away from it. So temperatures during the spring and fall are moderate, not too hot and not too cold. Since, the entire globe is getting about the same amount of direct sunlight at once. Now, let's take a look at how the amount of sunlight affects temperatures in the Northern Hemisphere over the course of a whole year. An easy way to show this yearly pattern is by using a graph. This graph shows the average high temperature each month for one year in Toranto, Canada, where I live. Looking at the graph we see that in December, January and February when the Northern Hemisphere getting very little direct sunlight temperatures are low. And in the months of June, July and August when the tilt of the Earth on its axis is causing Toronto to get direct sunlight, the temperatures are much higher. Proof positive something is going on here and that something is this, The season that you're experiencing right this very minute, is caused in part by the amount of direct sunlight you're getting. So, seasons are caused by the Earth's tilt on its axis as it cruises around the sun in its orbit. When one hemisphere gets more direct sunlight, its summer there, temperatures are warmer days are longer and nights are shorter and when it gets more indirect sunlight it's winter, temperatures are cooler days are shorter and nights are longer. And now you know what causes summer, spring, autumn, and winter.

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Duration: 3 minutes and 56 seconds
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Language: English
License: Dotsub - Standard License
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Views: 1,976
Posted by: schoogle on Dec 16, 2015

3 Seasons and the Sun- Crash Course Kids 11.1

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