Cylindrical inclined sundial

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Cylindrical inclined sundial


11 hour lines (at a distance of 15 degrees), engraved on a semi cylindrical concave surface (with a slope towards the celestial pole) define the 12 hours of the day. While the three curves define the course of the sun during the summer solstice (the lowest line) the equinoxes (the central line) and the winter solstice (the upper line).