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OFF Sundial Generator StarForge 3D Modeling Software

Sundial Trigonometry Lesson for School

Geometry students like OFF, the Object File Format from Geomview, for its readable vertex and face lists, and a sundial makes a memorable example of trigonometry turned into a mesh. The OFF Sundial Generator lays out hour lines by tan(angle) = sin(latitude) x tan(15 degrees x hours from noon) for a town found through OpenStreetMap place search, angles the gnomon to that latitude and raises the hour numbers on a dial of typed size. StarForge 3D Modeling Software exports a 3D Print STL File for 3D printing, so the lesson can stand in the school garden.

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