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Prediction and politics in Beijing, 1668: A Jesuit astronomer and his technical resources in a time of crisis

Christopher Cullen, Catherine Jami. Journal for the History of Astronomy 53, 2022, 422-474.

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Issue 4. Open access under CC BY-NC 4.0; the text was read in full from the authors' deposited copy. Its opening recapitulation is the source used here for the course of the Calendar Case, and its central subject is the gnomon-shadow trial of 27 to 29 December 1668, including the translated exchange in which Verbiest proposes observation as the test of an astronomical system.

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The Astronomical Bureau and the Calendar Case
Read in full. For the course of the prosecution and the house arrest, for the exchange in which Verbiest proposed observation as the test, for the three days of measurement, and for the dispute over the edge of the shadow and what Verbiest did about it.