And I'm Possum.
Oh! Hello, everyone!
What a beautiful day it is.
Oh, the sun is shining.
It feels so nice and warm.
Oh, hang on.
What's the sun doing over there?
I remember yesterday it was up here.
Why is that?
I saw it over there, too.
It's dark over there.
Why is that?
And it's bright over this side.
Hm. And look!
Oh. What's that? Huh?
I'd better go get Sally.
Quickly, Sally! Come on!
What is it, Possum?
It's copying me.
(LAUGHS) Yes, Possum.
That is your shadow.
Look, you can see my shadow over here.
It's being projected.
And the reason for that is
because the sun is shining light down,
but the light can't go through our bodies,
and that's why we get shadows.
Oh! That's right. I remember.
When I had my tent,
we got the teddy bear and then a torch,
and we shined the light on the teddy bear.
That made a shadow.
And then we put that piece of paper up
and we made shadow puppets.
Do you remember that?
Ah, that's right.
I thought the sun was half asleep,
but it was actually me.
I remember seeing shadows every day.
Have you noticed different shadows
and how they change during the day?
Oh, yes. I know my shadow.
As soon as I've eaten lunch,
it gets round in the middle.
Possum, you are funny. (LAUGHS)
But you're right.
I do remember seeing shadows.
Sometimes they're really long,
and sometimes they're really short.
They do change. I don't know why.
Well, you weren't half asleep at all, Possum.
You've thought a lot about shadows, haven't you?
The question I have for you is,
why is it that sometimes your shadow changes?
Sometimes it's long.
Sometimes it's short.
But I don't know why.
Why don't you and I
We need something to help us mark it out.
Would you like to do that?
Me? Stand there?
It'd be hard work all day standing there,
measuring, measuring, measuring.
Oh, I'd get hungry.
Will you make me some food?
OK, I could do it. It's fine.
No, I don't mean you have to stand there.
We just need to find a marker.
Oh, I see.
But what could we use?
Hm, I wonder.
I know. My letterbox post!
That would be a good marker.
What a great idea, Possum.
You get that and I'll get a few other things.
Now, can you see the shadow?
Why don't we put an orange right down at the end of the shadow?
Now, we just need the string and we'll cut it off, OK?
At seven o'clock in the morning,
this is how long the shadow is.
Can you put this there, please?
Now, we will wait for another hour,
and at eight o'clock,
we will see where the shadow is.
While we're waiting,
why don't we go inside?
There's something I'd like to show you, OK?
I'm ready, Sally!
What do you want to show me?
I wanted to show you what we've set up outside.
I want to show you more about shadows and how they change.
You'll get more of an understanding by using this.
This is you! Look!
That's much too small to be me.
I'm very big.
This is a model of you, Possum.
Can you please turn the lights off?
Great. Now, I've got a torch.
Possum, not on your face.
Can you please come
and stand on this side?
We're going to use the torch. Lower.
We'll pretend this is the morning sun
rising through the day,
but look where the shadow is.
Look how long it is.
Now lift the torch up,
and now it's here.
And look, a little bit more.
Little bit more.
It's only a little shadow, isn't it?
That looks great.
Now come around the other side.
Now, we pretend it's the afternoon sun.
Look at the shadow here and here.
And now here.
It's getting darker and darker because the sun has set.
It's all gone.
(LAUGHS) That's great, Sally!
This is what we've set up outside.
We've got our marker,
but we're not using a torch.
We're actually using the sun,
and the sun is projecting the shadow.
I think it's almost eight o'clock.
Should we go outside and have a look?
Oh, yeah! Come on!
Oh, put it over there?
Yes, you can see where to put it.
Now, I'll get the string.
Can you put that over there?
(GASPS) Look! Your shadow.
Could we get some rope and do an outline of your shadow?
Mm, that doesn't really look like me,
though, Possum, does it?
It is a shape, I guess.
It's really good fun to draw the outlines of shapes.
They actually form a silhouette.
Why don't we watch children learning about silhouettes?
Yeah, let's watch!
Oh, they look like they had great fun!
Yes, they did!
Those children learned so much about shadows and silhouettes.
Now we have to wait for it to be nine o'clock.
Yes, it's moved.
Shall we put an orange there as a marker?
It's five o'clock.
Oh, we have investigated quite a lot today,
and we've discovered that shadows
move depending on the sun.
Before, when the sun was low in the sky,
it was a long shadow from the marker.
Yeah, it was.
That means when the sun is higher,
the shadow is smaller.
Look at the small angle.
But this morning,
it was a long angle, wasn't it?
I understand, Sally.
It's a type of clock.
It tells us what time it is.
So now we know it's seven, eight,
all the way through to five o'clock.
Looking around now,
it's getting a bit darker.
The sun looks like it's about to set.
Oh! And look.
Sally, do you know what this means?
Oh, yes. It's dinnertime.
Yes! Oh, yum, yum!
Shall we go in?
Well, our time is up.
Thanks for watching.
See you next time.
Come on, let's go!>
Possum sees his shadow!
Has the Sun slept in? Sally explains the way that shadows change as the Earth moves and the Sun appears to change position through the day and they set up an experiment to find out more.
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