0:32:50 > 0:32:57.
0:33:04 > 0:33:08It's great to relax after a hard week's work.
0:33:08 > 0:33:11- What time is it, Bob? - Oh, I've forgotten my watch!
0:33:11 > 0:33:13Hm, now let's see.
0:33:13 > 0:33:16I think it's about midday.
0:33:16 > 0:33:17How do you know?
0:33:17 > 0:33:22- I used the sun, Lofty.- I didn't know the sun could tell you the time.
0:33:22 > 0:33:25Mister Sun! What's the time?
0:33:25 > 0:33:29The sun can't talk, Dizzy. I can tell it's the middle of the day,
0:33:29 > 0:33:33cos it's right above me and my shadow is very short.
0:33:33 > 0:33:35Look! My shadow's short, too.
0:33:35 > 0:33:38Everyone's is. In the morning, when the sun's low,
0:33:38 > 0:33:40it makes your shadow long.
0:33:40 > 0:33:43How does that work, Bob?
0:33:43 > 0:33:47Imagine this apple is the earth and this orange is the sun.
0:33:47 > 0:33:51- The sun is like a great big light. - It's really bright.
0:33:51 > 0:33:55Never look straight at the sun, cos it can hurt your eyes.
0:33:55 > 0:33:56Oh, erm... OK.
0:33:56 > 0:34:00The earth spins around each day, like this.
0:34:00 > 0:34:04When the earth is facing away from the sun, it's night.
0:34:04 > 0:34:06When we're facing towards it, it's day.
0:34:06 > 0:34:11So if you stood in the same place all day, the earth would turn
0:34:11 > 0:34:14and you'd see your shadow move around you.
0:34:14 > 0:34:16Rock and roll!
0:34:16 > 0:34:21We could build a sun dial. It's what they used in the old days.
0:34:26 > 0:34:30The sun is behind me, so I'm facing north. This is twelve noon.
0:34:30 > 0:34:34We'll use my watch to mark where the shadow falls every hour.
0:34:42 > 0:34:44Now, who can tell me the time?
0:34:44 > 0:34:45Oh, me! Me!
0:34:45 > 0:34:49I think it's six o'clock, Bob.
0:34:49 > 0:34:51That's right, Dizzy.
0:34:51 > 0:34:55BOB'S TUMMY RUMBLES
0:34:52 > 0:34:55My tummy doesn't need a sun dial.
0:34:55 > 0:34:58It knows exactly when it's time for dinner!