⏳ How People Told Time Before Clocks

Imagine every clock in Singapore disappeared. No phone. No watch. No microwave numbers.

How would you know when to eat lunch? When to go home? When school starts?

For thousands of years, people had no clocks at all. But they still knew when to plant rice, when to sail, and when to pray.

Their secret? They watched things that change in a steady, repeating way — the sun, water, sand, even a burning candle.

☀️ Sun 💧 Water ⏳ Sand 🕯️ Fire ⭐ Stars

Let's try them out, one by one. 👉

☀️ Trick 1: Watch the shadow

The sun rises in the east, climbs high at noon, and sets in the west. So a shadow moves too — and it changes length.

🌅 🌇

7 a.m. — long shadow, pointing west

Your turn 🔎

Drag the sun until the shadow is at its shortest. Then press the button below to check.

🕰️ Trick 2: Turn the shadow into a dial

Someone clever had a big idea: if the shadow always moves the same way, draw lines on the ground and label them!

That is a sundial. The stick that makes the shadow is called the gnomon (say: NO-mon). Ancient Egyptians used sundials over 3,500 years ago.

Tap the hour you think the shadow is pointing at.

💡 A sundial has one problem… can you guess it? (Next slide!)

🌧️ Trick 3: Time that keeps flowing

A sundial is useless at night — and in Singapore, useless during a big thunderstorm too! So people needed a timer that never stops.

Answer: a water clock. Water drips out of a pot at a steady speed. Marks inside the pot show how much time has passed. Ancient Egypt, China and Greece all used them.

Mission: fill the bowl to the blue line — that means 3 hours. Drip carefully!

0 hours of water

⏳🕯️⭐ More clever clocks

Water was not the only trick. Tap each card to discover it!

⏳ Hourglass Sand falls through a narrow neck. Sailors used a 30-minute glass to time their watch on deck.

🕯️ Candle clock A candle with lines on it. Burn one line = one hour. Some had pins that fell and went "ting!" — the first alarm!

🪔 Incense clock Used in China. A trail of incense burns slowly — and different sections can even smell different as the hours pass.

⭐ Star clock At night, stars sweep across the sky like a giant dial. Sailors read the stars to tell the hour and find their way.

🐓 The rooster Roosters crow near dawn. Not exact — but free, and it wakes the whole kampong!

🔔 Town bell & drum One person watched the time, then rang a bell or beat a drum so the whole town heard the hour.

Tapped 0 of 6.

🧠 Match the clock to the moment

Here is the big idea: sun clocks need sunshine. Flow clocks (water, sand, fire) work anywhere — even in a dark room.

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🌙

Question 1 of 4

📜 Put history in order

Clocks got better and better. Drag each invention into the right spot — oldest first.

1st (oldest)

2nd

3rd

4th (newest)

Tap a card, then tap a slot. (Or drag it.)

⏰ From shadows to your phone

Every clock — old or new — does the same one job: it finds something that repeats steadily and counts it.

Sun → water → gears → a tiny crystal buzzing in your phone.

One last thinking question 🤔

You are camping with no phone. It is a sunny afternoon and you must boil noodles for 3 minutes. What is the best tool?

🎉 Well done, time detective!

You now know how people told time for thousands of years — with no clock in sight.

⏳☀️🕯️⭐

☀️ Shadows move as the sun crosses the sky — shortest shadow means about noon.
🕰️ A sundial is a shadow plus labelled lines. Its stick is the gnomon.
🌧️ Sundials fail at night or in rain — so people used water clocks that keep flowing.
⏳ Sand, candles, incense and stars all measured time too — even smelly incense clocks!
🔁 The big idea: every clock counts something that repeats steadily.

Time Detective ⭐

Try it yourself: go outside on a sunny day, stand still, and look at your shadow. Is it long or short? Now you can guess the time! 🕵️