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Astronomers as Diplomats: When the IAU builds bridges between nationsObservatoire de Paris, 4 octobre 2019 (IAP Auditorium: 98 bis Bd Arago, Paris 14)RationaleBorn in the aftermath on WWI, the IAU had to cope with many crises and conflicts between nations. After WWII, the IAU played an important role in building bridges between their astronomers. A one-day «IAU@100» celebration will be held at Institut d’Astrophysique de Paris and Observatoire de Paris, with several talks, in particular on the creation of the IAU, the China crisis, the adherence of Germany, the USA-USSR Moon race, and the cooperation with UNESCO.Organizing Committee Thierry Montmerle (Chair; IAP), past IAU General Secretary (2012-2015); Teresa Lago, IAU General Secretary (2018-2021); Jean-Louis Bougeret (LESIA, Observatoire de Paris); Nicole Capitaine (Académie des Sciences; SYRTE, Observatoire de Paris)  ; Danielle Fauque (Groupe d’Histoire et de Diffusion des Sciences, Université Paris-Sud; International Union of Pure and Applied Chemistry - IUPAC) ; Annie Robin (Observatoire de Besançon; SF2A: French national contact for the IAU)Notre collègue Nicole Capitaine, présentera une conférence sur : "The foundation of the Bureau International de l’Heure"Voir le programme complet ici : http://www.iap.fr/vie_scientifique/ateliers/divers/ProgrammeIAU0410.pdf Pour s'inscrire, envoyer un e-mail à Thierry Montmerle : montmerl@iap.fr