Sonnenborgh Observatory (; obs. code:

015 015 may refer to: * 015, a telephone numbers in Malaysia, telephone number code in Malaysia * ''Global Underground 015'', DJ mix album by Darren Emerson * ''The Haunting of Tram Car 015'', 2019 novella by P. Djèlí Clark * JWH-015, chemical from t ...

) is an

astronomical observatory An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysics, oceanography and volcanology are examples of disciplines for which observatories have been constructed. Th ...

and

museum A museum is an institution dedicated to displaying or Preservation (library and archive), preserving culturally or scientifically significant objects. Many museums have exhibitions of these objects on public display, and some have private colle ...

open to the

public In public relations and communication science, publics are groups of individual people, and the public (a.k.a. the general public) is the totality of such groupings. This is a different concept to the sociology, sociological concept of the ''Öf ...

, located in

Utrecht Utrecht ( ; ; ) is the List of cities in the Netherlands by province, fourth-largest city of the Netherlands, as well as the capital and the most populous city of the Provinces of the Netherlands, province of Utrecht (province), Utrecht. The ...

Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...

. It is located in one of the four stone forts built by

Charles V Charles V may refer to: Kings and Emperors * Charles V, Holy Roman Emperor (1500–1558) * Charles V of Naples (1661–1700), better known as Charles II of Spain * Charles V of France (1338–1380), called the Wise Others * Charles V, Duke ...

as defense buildings for Utrecht. In 1639 the fort was expanded with an academic herbal garden by members of

Utrecht University Utrecht University (UU; , formerly ''Rijksuniversiteit Utrecht'') is a public university, public research university in Utrecht, Netherlands. Established , it is one of the oldest universities in the Netherlands. In 2023, it had an enrollment of ...

, three years after its founding. The garden was moved in 1724 to the current location of the Oude Hortus. During reconstruction works in 2001 remains were found of the first chemical

laboratory A laboratory (; ; colloquially lab) is a facility that provides controlled conditions in which scientific or technological research, experiments, and measurement may be performed. Laboratories are found in a variety of settings such as schools ...

in Utrecht, third in the world. The lab was led by the first chemistry-only professor in Utrecht Johann Conrad Barchusen. The observatory was founded by C. H. D. Buys Ballot in 1853 as a university observatory (of the

University of Utrecht Utrecht University (UU; , formerly ''Rijksuniversiteit Utrecht'') is a public research university in Utrecht, Netherlands. Established , it is one of the oldest universities in the Netherlands. In 2023, it had an enrollment of 39,769 students, a ...

) and from 1854 until 1897 it was the first home of the Royal Dutch Meteorological Institute. After the meteorological institute moved to

de Bilt De Bilt () is a Municipalities of the Netherlands, municipality and town in the Provinces of the Netherlands, province of Utrecht (province), Utrecht, Netherlands. It had a population of in . De Bilt houses the headquarters of the Royal Netherland ...

it was operated again by Utrecht University. In 2013 its main function became a museum, organising viewing evenings for amateur astronomists. It is located on, what is now, the only surviving

bastion A bastion is a structure projecting outward from the curtain wall of a fortification, most commonly angular in shape and positioned at the corners of the fort. The fully developed bastion consists of two faces and two flanks, with fire from the ...

of the city walls of Utrecht. Among the directors of the observatory were

Jean Abraham Chrétien Oudemans Jean Abraham Chrétien Oudemans (Amsterdam, 16 December 1827 – Utrecht, 14 December 1906) was a Dutch astronomer. He was the director of the Utrecht Observatory from 1875 until 1898, when he retired. Oudemans was born in Amsterdam, son of ...

, Martin Hoek,

Albertus Antonie Nijland Albertus (Albert) Antonie Nijland (30 October 1868 – 18 August 1936) was a Dutch astronomer. He was professor of astronomy at the Utrecht University, Rijksuniversiteit Utrecht, and served as director of the ''Sterrewacht Sonnenborgh'' (now ...

Marcel Minnaert Marcel Gilles Jozef Minnaert (12 February 1893 – 26 October 1970) was a Belgian-Dutch astronomer. He was born in Bruges and died in Utrecht. He is notable for his contributions to astronomy and physics and for a popular book on meteorologic ...

and

Kees de Jager Cornelis "Kees" de Jager (; 29 April 1921 – 27 May 2021) was a Dutch astronomer who specialized in predicting solar variation to assess the Sun's impact on future climate. He was the General Secretary of the IAU from 1967 to 1973 and former d ...

. The main topic of research was the

Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...

, which resulted in 1940 in the publication of the

Utrecht Atlas The ''Utrecht Atlas'' of the solar spectrum is a detailed inventory in graphical form of spectral lines observed in sunlight at the Sonnenborgh Observatory. The visible spectrum is about 390 to 700 nm and the atlas covers from 361.2 to 877.1 ...

of the solar

spectrum A spectrum (: spectra or spectrums) is a set of related ideas, objects, or properties whose features overlap such that they blend to form a continuum. The word ''spectrum'' was first used scientifically in optics to describe the rainbow of co ...

. In 2021, The

European Physical Society The European Physical Society (EPS) is a non-profit organisation whose purpose is to promote physics and physicists in Europe through methods such as physics outreach, supporting physicists to engage in the design and implementation of European s ...

(EPS) named it as an official EPS Historic Site.

References

External links

Sonnenborgh Museum
* Astronomical observatories in the Netherlands Public observatories Rijksmonuments in Utrecht (city) Museums in Utrecht (city) Science museums in the Netherlands Buildings and structures in Utrecht (city) {{observatory-stub

See also

References

External links