Following the Sun: Crash Course Kids #8.2

Following the Sun: Crash Course Kids #8.2


[Crash Course Kids Theme Song] Have you ever noticed maybe on a nice
summer evening and you’re running around outside but your shadow looks super long,
but then at other times of the day it’s really short. What’s up with that? Does your shadow have a mind of it’s own like Peter Pan’s? Nope. I mean I hope not that’d be strange.
To understand how shadows move over the days. Let’s talk about what a shadow is,
exactly. Say you’re standing outside in the sun and you spot your body shadow. Your body is solid that means it can
block sunlight since unlike can’t pass through your body it makes a dark area
behind it, opposite from the direction the sun is
coming from. This dark part where the sunlight can’t reach is your shadow. So,
why doesn’t this dark patch stay in the same spot throughout the day? Well for
one thing you move so your shadow moves with you. But let’s pretend you stand in
the same spot all day long. No wait, that sounds super boring. Just
picture something that doesn’t move around, like a tree or a building. Its
shadow would still move throughout the day. That’s because the shadow is made by the
light of the Sun and the Sun is constantly moving in the sky. Well, you know, it’s not really the Sun
that’s moving. You should definitely check out our video about how the earth
moves ,or rotates, on its axis making the sun appear to move across the sky. Even though it constantly seems to be
changing where it is in the sky, some people know exactly where the Sun
is going to be at certain points during the day. In fact ancient civilizations
thousands of years ago use the Sun like a giant clock. They could tell what time it was based
on the sun’s position in the sky. How they figure that out? Because the
sun follows a certain pattern every day, these civilizations saw the Sun rising
in the east and setting in the West day after day. Soon they were able to guess
what time it was based on where the Sun was on its path from east to west. Cool huh, and since the movement of the
Sun follows patterns during the day, so does the movement of shadows Any idea what the shadow patterns might
look like? Let’s find out. We’ll follow the Sun for a day and see
how it changes the shadow of a specific object. Then we can track the length in
the direction of the shadow from morning to evening to see which patterns we can
spot. First let’s pick an object that stands still, not running around all
crazy. Like how about a lamppost, say one that’s about 4 meters tall. Now let’s
start early in the morning, 7am Sun show us what you got. The lamp post has a
pretty long shadow this early in the morning and it looks like it’s extending
to the west. What happens to the shadow if we
fast-forward to 9am? Interesting, the shadow still pretty long but not
quite as long as at 7am, and it’s still stretching out towards the west. So let’s see what happens at 11am. Well,
look at that .The shadows even shorter, but again still pointing Westward, o in
the morning it looks like the lamppost shadow starts out long and get shorter
as we get closer to noon, but they all extend to the west. What happens at noon:
hardly any shadow. The Sun is high in the sky at noon,
almost directly overhead. Depending on where on earth an object is
it shadow will usually point north or south at noon. Rather than east or west let’s see what
happens to the shadow in the afternoon. Jumping to 2pm looks like the shadows are
getting a little bit longer again. Now that the sun’s going lower in the sky,
but unlike in the morning the shadow is now pointing East. Well the shadow continue to get longer
at 4pm. Yep it’s definitely getting longer. Still pointing East. To how about 6pm the
shadows about as long as it was in the morning. Right? But, again unlike in the morning the
shadow is stretching out towards the east. So what patterns did we see the
lamppost shadow follow? Let’s look at these two bar graphs that
recorded our observations. In the first graph we’ve charted the length of the
lamppost shadows. Based on what we observed with the
lamppost the Sun created long shadows in the morning when it was rising in the
east. When it was almost directly overhead at noon the shadows were
shorter. Then as the Sun set in the West in the afternoon the shadows got longer
again. And what did we observe about the
direction the shadows were going in at certain points of the day? Well, like the second graph shows us, we
saw that the shadows in the morning and afternoon face two different directions. In the midday shadow was somewhere in
between. So, graph number one shows us that when the Sun is low in the sky, shadows are long. When it’s high in the
sky, shadows are short. Graph number two shows us that whatever direction the sun
is in the sky, the shadows it creates will be in the
opposite direction. So now you know what a shadow is and
that it changes in both length and direction during the day depending on
where the Sun is in the sky. Basically, the Sun is your shadows boss.
Yes Sun no Sun whatever you say Sun. [them music]

100 COMMENTS

    This is very helpful for kids and me to learn a bit more or a lot more of your smart opinion of your choice* I’m in 4th grade so do not judge πŸ‘©β€βš–οΈ me ok πŸ‘Œ if you did I can report you ( he or she ) *

    Can I have a suggestion? Instead of going back and forth of the lamppost and with you speaking, can you just retain the video in the lamppost while you speak? Children are really visual, they will not appreciate it when it skipped time and will not be able to see the transition of the moving shadows

    Thank you so much for these videos! It has helped my daughter pass a important text! I love this and i make her watch one of these Crash Courses everyday.

    πŸ‘ΎπŸ‘ΎπŸ‘ΎπŸ‘ΎπŸ‘ΎπŸ‘ΎπŸ‘ΎπŸ‘Ύ. πŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘¨πŸΌβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘©πŸΎβ€πŸ’ΌπŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ‘¨πŸ»β€πŸŽ“πŸ’‚πŸ»β€β™‚οΈπŸ’‚πŸ»β€β™‚οΈπŸ’‚πŸ»β€β™‚οΈπŸ’‚πŸ»β€β™‚οΈπŸ’‚πŸ»β€β™‚οΈπŸ’‚πŸ»β€β™‚οΈπŸ’‚πŸ»β€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈπŸ§πŸΌβ€β™‚οΈ

    Again, I pointed out all your errors and misinformation in this video, and you respond by saying you have included subtitles. That's lovely, but what about the Sun moving in the wrong direction across the sky, appearing at noon in the north? And why the is it snowing with a perfectly sunny sky? And how can you say the Sun is overhead at noon? That can only occur in the tropics, never outside that area of the Earth. This video should be removed, esp. since all the teachers watching it seem to think it's authentic. Adding subtitles did not correct your mistakes!

    love the way you precent a simple concept,need more like you,you have to have a cliear understanding,and then you simplyfy it,
    gold star,thank you.

    Not very good.

    Speaker jumps all over the place and speaks at too high of a rate.
    Kids that understand bar graphs, already understand how shadow work.

    Very good πŸ‘πŸ‘πŸ‘πŸ‘ and I'm in year4πŸ˜πŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚

    Great info, but my kids can't follow because the talking is too fast and the video switches from screen to screen too fast. If you're showing the shadows changing size at different times, don't keep cutting back to her.

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