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Outcomes

Pupils can explain how a sundial is used to measure time
Pupils understand the concept of reaction time, the factors that affect it and can recall one way of measuring reaction time

Specification References

Display images of different sundials, progressing through time; Show time-lapse video of sundial, an examples can be found here, here, here and here

To guide the lesson, there is a power point presentation
Make sundials; templates need to be printed onto card, a selection of templates can be found for inclined, equatorial, polar, cycloid polar, cross, equitorial, universal ring
Make and use reaction timers; high ability worksheet and low ability, you may wish them to test their reaction time using a fake 'fiver'
Discuss factors affecting reaction time. There is a really nice web site to simulate reation time and stopping distances.

For their homework the pupils will need to use this web site and answer the questions in this worksheet.

to use some of the sundials you will require the latitude, you can find this at this not so nice web site or just stand outside and use a GPS.
- Or ask Alby: Broadfield is at 51° 14' 11.27"N (0° 11' 32.83"W).
excellent sundial website with all resources can be found at

Craft equipment, particularly any knives or scissors, please see the risk assessment about using Knives and sharp objects

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