This feature will be a regular picture-based item that you might use with your pupils, or your department, or just by yourself, to make you think about something in a different way
This picture was taken at Barrington Court, a National Trust in Somerset - another holiday snap!
This stunning sundial has a gnomon on ten of the twelve faces. Many sundials only have one dial from which to read the time and this tends to be a flat dial in either a horizontal or vertical plane. These ten dials make it possible to tell the time for a greater span of the day - as long as the sun is shining!
You could ask your pupils:
- How many faces, vertices and edges does the polyhedron around which the sundial is built have?
What shape is each of its faces?
- What other polyhedra have faces all the same shape? (The Platonic solids).
- Every polyhedron has a dual, in which the vertices of the dual polyhedron are the midpoint of the faces of the original polyhedron. What are the dual polyhedra for the platonic solids?
And then they can download and make their own dodecahedron calendar for 2015.
If you have a thought-inducing picture, please send a copy (ideally, about 1-2Mb), and a short (150 words maximum) commentary, to us at firstname.lastname@example.org - we look forward to hearing from you!
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