Sterrewacht Sonnenborgh

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.