1. Sundials
L.O: I can tell you what a sundial is and how this is linked to shadows caused by the sun

2. Telling the Time Sundials were the first clocks
The shadows told people what time it was
The Earth takes 24 hours to rotate around the sun
Sundials only have shadows when it is sunny
Shadows change position when the Earth moves

3. History The Egyptians invented the first sundial around 3500 BC
These were obelisks that caused a shadow

4. Discuss: Why is this fact so important?
Smaller Sundials
The Egyptians then invented another sundial around 1500 BC
This divided the day into 10 parts and 2 twilight hours
Discuss: Why is this fact so important?

5. Do you think the Sundial was accurate?
Winter and Summer
Cloudy days
Different towns, different times