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Cerdà, Thomás
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Cerdà studied mathematics under Pézenas in Marseille
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Fournier, Georges
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Fournier collaborated with Boulliau on astronomical observations in Paris
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1620 – 1627
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François, Jean
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Direct exchange between François and Mersenne in Paris in the years 1620 – 1627
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Hell, Maximilian
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Hell corresponded with a number of scientific academies such as in Paris, Copenhagen, Göttingen, Stockholm, Trondheim, and Bologna
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de Laval, Antoine
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Laval established an astronomical observatory in Marseille and compiled naval maps of the French coast
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1618 – 1630
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Malapert, Charles
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From 1618 – 1627 or 1618 – 1630, Sylvius assisted Malapert in conducting astronomical observations in Douai
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Malapert, Charles
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Sylvius left Kalisz with or shortly after Malapert, first following him to Douai, later accompanying him on the way to Madrid( Malapert died during the journey while Sylvius finished it and worked in Madrid for a while)
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Morand, Jean Claude Ignace
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Morand constructed an astronomical observatory in Avignon
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1633
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Perovius, Szymon
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In 1618, Perovius conducted astronomical observations in Kalisz; the results were published by Malapert in his “ Austriaca sidera ” ( Douai, 1633)
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Poczobut, Marcin
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Poczobut was student and assistant of Pézenas in Marseille
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de Saint-Bonnet, Jean
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Saint-Bonnet was commissioned by Cassini to build an astronomical observatory on top of the church of the Lyon college; he died in an accident during the construction
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