Philipp Matthäus Hahn
![Matthäus Hahn](https://upload.wikimedia.org/wikipedia/commons/1/1b/Portr%C3%A4t_des_Philipp_Matth%C3%A4us_Hahn.jpg)
In about 1763 he devised a precision sundial, or ''heliochronometer'' that incorporated the correction for the equation of time.
In 1774 he designed one of the earliest mechanical calculators of which two are known to have survived to the present day. A renowned clockmaker, several horological museums display his works, including the Deutsches Uhrenmuseum which contains a mechanical orrery (planetarium) and a Weltmaschine by the "Priestermechaniker (priest mechanic)". Provided by Wikipedia
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Published: [2012]
Superior document: Title is part of eBook package: De Gruyter DGBA Theology and Religious Studies <1990
2
Published: [2012]
Superior document: Title is part of eBook package: De Gruyter DGBA Theology and Religious Studies <1990
3
Published: [2022]
Superior document: Title is part of eBook package: De Gruyter DGBA Physical Sciences <1990
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