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Portrait of Hendrick de Hartog  1790

by Adriaan de Lelie

Hendrick de Hartog taught mathematics at the Felix Meritis Society on Monday evenings. He had this portrait made when the Dutch East India Company (VOC) appointed him a navigation examiner. On the table are a telescope and a sextant. De Hartog had devised a new, viable arithmetic method for calculating lunar distance while at sea.
Courtesy of Rijksmuseum