Hemispherical sundial with a central gnomon point (Anaximandros’ sundial)

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Hemispherical sundial
with a central gnomon point
(Anaximandros’ sundial)


11 hour lines (arranged at distances of 15°) which are engraved on the surface of a concave hemisphere, define the 12 hours of the day, while three curves define the course of the sun according to the summer solstices (the lowest line), the equinoxes (the central line) and the winter solstices (the upper line). On other days, the shadow trace from the vertical gnomon top (orientated to the South) outlines parallel arcs between the curves, according to the season.