Utrecht astronomy
was
housed from 1863 until 1987 as “Sterrewacht Sonnenborgh” on
Zonnenburg, a city-wall fortification built in 1552. Its history is well
described in these brochures (in Dutch) by Minnaert and
De Jager:
M.G.J. Minnaert's beschrijving van Sterrewacht
Sonnenborgh uit 1953
C. de Jager's beschrijving van Sterrewacht
Sonnenborgh uit 1977
See also:
Hans Nieuwenhuijzen's photographs 1956-1969
The buildings at Zonnenburg now house “Museum
Sterrenwacht Sonnenborgh”. C. de Jager played a key
role in its creation.