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The year 2012 will be the fourth centennial year of the Jesuit ChristopherClavius (1535-1612), known as the Euclid of XVI century and the collaborator ofthe Pope Gregory XIII for the calendar reformation. In the occasion of the yearof astronomy I wrote a short theatre pi\`ece "Celestial encounters" dedicatedto the life of Ft. Clavius. He observed two total eclipses from centreline in1560 in Coimbra and in 1567 in Rome, a fact which is remarkable even forcontemporary astronomers. The story is developed around those trips: scientificand religious motivations are put in evidence with historical and fantasy, butrealistic, facts. An interregional project between Switzerland and Italy,dedicated to the development of high resolution CMOS camera for astronomy andmedical sciences has been entitled to Clavius and will produce high resolutionmeasurements of solar diameter.

Incontri celesti, vita del padre Clavio in cinque atti