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Johannes Hevelius's 1662 Mercurius in Sole Visus Gedani contains a table ofmagnitudes and apparent telescopic diameters of nineteen stars. The dataconform to a simple model, suggesting that Hevelius produced what isessentially a table of surprisingly precise photometric data.

17th Century Photometric Data in the Form of Johannes Hevelius's Telescopic Measurements of the Apparent Diameters of Stars