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Plusieurs membres du projet BDL 1795-1932 participeront au 25e Congrès international d'histoire des sciences et technologie qui aura lieu à Río de Janeiro (Brési) du 23 au 30 juillet 2017.Marina Rieznik (Conicet-UNQ-UBA. Argentina) fera une intervention lors de la session "Observatories and modern Nation-building since the Nineteenth Century" (organisée par Charlotte Bigg et Rodrigo Booth) sur : "Bureau des Longitudes, popular astronomy and the foundation of the La Plata`s observatory" dont voici le résumé :In 1882, in Argentina, the governor of Buenos Aires province and members of France’s Bureau of Longitudes fostered one of the international missions that were observing the transit of Venus across the sun. The local government claimed that instruments they used would serve in the founding of an observatory in La Plata. In this talk I stress the interrelationships between the foundation of that observatory and the popular spreading of news about the transit of Venus. The interest is to get into the historical construction of the assumption that claims that there is a clear limit between amateur records and scientific registry. Also we will show that the competitions between observatories were involved in the construction of that limit.&#160;