Abstract
Cornelis de Jager (1921–2021) Astronomer, pioneer of European space research, inspiring teacher, and a popularizer of science, here remembered by Edward P J van den Heuvel. Kees de Jager was born on 29 April 1921 in Den Burg on the Dutch island of Texel, the place where he returned to live for his last 18 years. He spent his childhood in the Dutch East Indies (now Indonesia), where his father was principal of a primary school, first in North Celebes (now Sulawesi), where Kees attended primary school, and later on Java, where Kees completed his secondary education (HBS) in the city of Surabaya, where he also met Doetie Rienks, later his wife. The beautiful starry sky of Celebes made a deep impression on him. His father had already pointed out the different colours of the stars and told him that this meant that they had different temperatures, which sparked Kees's interest in astronomy.
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