Jan Frederik van Beeck Calkoen
(1772-1811)

Ph.D., University of Groningen, 1797
Thesis: Dissertatio mathematico-antiquaria de horologiis veterum sciothericis cui accedit theoria solariorum horam azimuthum et altitudinem solis una exhibentium (Antiquarian-mathematical dissertation concerning the shadow clocks [sundials] of the ancients, to which is added the theory of solaria which display the hour, azimuth, and altitude of the Sun at the same time)

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