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Montgomery stile. Glory Hole, Lincoln.
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ARMILLARY SPHERE
C.A.D Drawing of sphere in plan. The Spheres Central bar acts as a 'Gnomon', Casting A shadow around the outer ring.
Because the Gnomon is orientated towards True South & parallel to the earths axis the shadows position on theouter ring is, theoretically proportional to the Earth's angle of rotation.
Recommended reading:'Sundials, Their theory & Construction' by AlbertE.Waugh, Dover Publications.
 
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'Gnomon' used to strike shadow across band. Diagram of sundial. Roman numerals cut into band.
Shadow indicating 12:30 G.M.T/ 13:30 British summertime.
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