Audio Transcript Auto-generated
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stories, Mr Ewing.
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Welcome. You know, I think it's time to spend a
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little time talking about time now.
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Way before you actually could reach in your pocket a
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lot. You're feeling to know what time it was or
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looked down at risk and have that little computer sitting
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there that not only tells you what your time is,
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but the alarm goes off.
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It keeps you on track.
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You know, even before we had digital clocks.
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Now, before we have digital clocks, we had what's called
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an analog clock and an analog clock just meant you
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had to read it.
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It didn't kind of tell you digits.
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Now I had a very, very similar washing this when
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I was a little kid.
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And the challenge was to figure out which numbers Mickey's
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hands were pointing at.
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Now I love this watch, and it was really great.
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Didn't actually helped me learn to tell time.
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And I'm sure that you in your classroom have a
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watch that's very clock on the wall.
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That's very similar to this.
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And you probably look at it every day and go.
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I have no idea.
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Well, you know, before I learned to do that are
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youse a watch like that?
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My grandfather used to watch very similar to this, and
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it actually didn't go on his wrist.
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It went in a pocket.
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It's actually called a pocket watch.
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Now. That was during a time where we had all
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kinds of different clocks.
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We had wall clocks.
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We have grandfather clocks.
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We had big clocks.
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We had small clocks.
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We had a lot of clocks.
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Problem is because it weren't all run by a central
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place. All the time was always a little bit different.
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And before we had 100 different clocks in our house
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because, you know, there was a time even if my
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parents house, like almost every room, had a clock and
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not every clock had the same time on it.
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But way back when in the center of town, on
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a charge of staple of government building, there would always
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usually be a big clock tower.
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And that was really how people set time.
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Now it would chime of the hour chime at the
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half hour and sometimes at the quarter hours, so that
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would allow people who are working out in the streets
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or in the fields or around town to actually be
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able to keep in track time.
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Um, but even before that, people were always wondering how
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to tell time.
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Now we go back to the battle 150 BC long
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time ago, a few years before Mr Yeung was born,
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there was a mathematician and astronomer, and I'm gonna mess
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up this guy's name.
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But Theo Theodosius I'm just gonna call him Teddy.
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Teddy came up with an idea that we could actually
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tell time with, son.
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Now you would think the son I can't look up
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in the sun.
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The sun's not going to talk to me.
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And there's no clock face or anything on the sun.
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So how did this guy Teddy figure out?
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We could use the sun now.
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What he noticed was that the sun, at different times
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of the day, cast different shadows on the ground.
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Now the sun When it was straight up above us,
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which is around roughly noon, the shadows were really kind
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of short.
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And as it goes up into the sky and goes
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down in the sky and remember, the sun actually doesn't
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move. It's the earth rotating that makes it appear to
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move. But the shadows on the ground change, and he
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realized the shadows tend to be in the same place
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at the same time of the day.
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And because of that, he actually created what we call
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a sun dial.
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Now, this is a very van fancy version of the
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sun dial that Teddy created.
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This is a later version has was much simpler.
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So today we're gonna actually make a sun dial.
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So you're probably wondering, Monsieur, and what do we need?
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And it's simple.
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We need a plate.
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But it could be any side you want any kind
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of want.
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I recommend if you have a style from one of
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phone plate, it actually works a little bit better.
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And then you're gonna need a straight stick.
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How a chopstick, a pencil upend something that you're able
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to push through the plate.
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Now I wanna warn you that using probably a larger
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marker isn't really gonna work.
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But if it's not all you got, that's all you
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have. Now, be creative.
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Look around your house pencils.
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Probably going to be the quickest thing that we can
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find and a pen and actually make it easier.
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So what we're gonna do is you're gonna take a
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pencil and it helps if it has a bit of
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a point on.
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What I need for you to do is to ask
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one of your adult members of your family to help
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you out with this.
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But what you're gonna do is you're gonna find the
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center of the plate and you're actually going to take
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pencil and very carefully push through so that it does
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this. Now what you're gonna need to do before you
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do it will help is actually on your plate.
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Put the different times of the day.
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Here's 12 63 and nine.
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I know it's backwards in my camera, but I think
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you can figure this out.
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No one other really important piece that you gotta find
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and order for this to work.
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We need to do something really important.
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This number 12 has to be put in the direction
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of north, so you may go out and find a
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camp compass.
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Make sure that if North whatever north ist pointing in
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the direction that you're 12 is pointing in the direction
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the same way, So if North is that way, you're
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12 that way and by whenever and you figured out.
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Spent a little time, you might have to download an
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app on your phone.
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If you need do that.
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Remember, always ask permission before you do that.
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Now, in order for this, also work is you need
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to find the sun, and if it's cloudy day it
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will work.
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It's gonna take a little bit more of a challenge
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to get it to work.
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But if you have the direct sun coming in a
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window at your home, that'll work.
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Or if you're going to say you're gonna walk to
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the grocery store to get some stuff, bring your Sundell
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with you and your place is on the ground.
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Remember to make that sure that 12 is facing north,
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and if you look at the shadow that is being
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cast but see, you can actually see wow sounds a
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little bit too bright on my sunshine, but the point
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on your plate will actually point to the time it
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is on your phone.
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If you want to do an experiment to see if
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it's true, find a spot where you can put your
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play each day and at different times of the hour,
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actually start to mark on your plate with a black
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magic marker.
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If my shadow is right here, I'm gonna put a
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mark and I'm gonna put that is 3 30 cause
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that's actually the time.
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And then for now, for now, I'm going to see
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and I'm gonna mark the next shadow.
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And I could mark that at 4 30 and then
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tomorrow I'm gonna put that plate in that same spot
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at the same time and see if my shadows are
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correct. There's a few different versions that you have from
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your Sunday I'll.
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But I want you to find north.
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Make sure your 12 top of your your clock is
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pointing north and go out and find some time to
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enjoy some science and go explore what time and the
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sun have in common and why they're related.
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So I hope you have a good time