An instrument or mechanical model used to simulate the path and position of the sun across the sky for different locations and times of year.
From Greek 'helios' (sun) and 'odous' (tooth, but here meaning a position or marker), a term primarily used in architecture and urban planning.
Architects use heliodons to test how sunlight will hit buildings at different times—it's basically a sun simulator that helps design buildings that stay cool or warm as needed!
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