Category:Nodus-based sundials

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This category groups media relating to nodus-based sundials, those that tell time from the movement of the shadow of a point (the nodus) or from the movement of a spot of sunlight passing through an aperture. Since the sun moves approximately on a circle on the celestial sphere over the course of one day, the nodus traces out a conic section if it falls on a plane.

Deutsch: Sonnenuhr mit Nodus


This category has the following 6 subcategories, out of 6 total.

Media in category "Nodus-based sundials"

The following 98 files are in this category, out of 98 total.