Klinghammer's computus
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Klinghammer's computus is a mechanism determining the elements of the computus, in particular the date of Easter in the Gregorian calendar. This mechanism was built in the 1970s by Frédéric Klinghammer (1908–2006) and is nearly a reduced model of the computus found on the Strasbourg cathedral astronomical clock.
Frédéric Klinghammer was a former employee of the Ungerer company, a company which used to take care of the Strasbourg astronomical clock. He was then seriously involved in the design and building of the Messina astronomical clock. Later, he set down in Moulins (France) and spend the 1970s in Morocco where he built his computus.