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Discover
Places to see
Germany
Baden-Württemberg

Tübingen District

Zollernalbkreis
Albstadt

Ring Sundial – Memorial to Philipp Matthäus Hahn

Discover
Places to see
Germany
Baden-Württemberg

Tübingen District

Zollernalbkreis
Albstadt

Ring Sundial – Memorial to Philipp Matthäus Hahn

Highlight • Monument

Ring Sundial – Memorial to Philipp Matthäus Hahn

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Geopark Schwäbische Alb

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  • Location: Albstadt, Zollernalbkreis, Tübingen District, Baden-Württemberg, Germany

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    November 29, 2025

    Hiking

    Monument with information panel

    Ring sundial

    (Magnified seven times, moving parts welded together.)

    Clockmakers used ring sundials to check their clockwork mechanisms. Pastor Philipp Matthäus Hahn developed his eye sundial from this design.

    The ring sundial consists of the meridian ring, which in our region must be set to the 48th parallel, and the hour ring. The slider with the sun hole (eye) is set to the month, and the entire assembly is rotated until a ray of sunlight passes through the eye and onto the hour ring.
    Translated by
    The eye-shaped sundial by Philipp Matthäus Hahn is a sundial with a sighting device. The user rotates it towards the sun so that the spot of light created by a pinhole aperture (an eye, also known as a nodus) aligns with a marker (the sight line, or the single line on the dial). The rotation of the sight (around the polar axis) is transferred by gears to hour and minute hands, which indicate the time of day on a circular 12-hour/60-minute dial. Hahn used this sundial, without a magnetic needle, to align the mechanical clocks he also manufactured.
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    Elevation 810 m

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    Saturday 16 May

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    Max wind speed: 8.0 km/h

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    Location: Albstadt, Zollernalbkreis, Tübingen District, Baden-Württemberg, Germany

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