Prof. Dr. Kees de Jager. World famous astronomer. Honorary member of the NVR and Pioneer of Dutch space research. Former director of the Sonnenborgh observatory and SRON space research institute. Great popularizer of science. These are just a few of the many peaks in his long and broadly oriented career. On April 29, he completed his100th orbit around his sun. This astronomical milestone was celebrated in the scientific community online from Sonnenborgh. see:


Within our association, Kees de Jager wrote various articles. Two notable contributions were in the launch of Sputnik 1 in Space 1957_5 :

“Delighting – whoever achieves it first – that the human mind proves capable of such a great achievement.”

and an extensive article on correctly observing satellites in Space 1958_1

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