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

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Presentation transcript:

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

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

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

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?

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