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Hendricus Gerardus van de Sande Bakhuyzen (April 2, 1838, The Hague – January 8, 1923, Leiden) was a Dutch astronomer. His surname, van de Sande Bakhuyzen, is sometimes erroneously given as Backhuyzen or Bakhuysen. His first name is sometimes given as Hendrik Gerard.
He studied astronomy under Frederik Kaiser.
After he got his degree, he was a high school teacher from 1864–1867, during which time he wrote a very successful textbook on mechanics. In 1867 he became a professor at the Technical College in 
He became director of the Leiden Observatory in 1872 upon the death of Frederik Kaiser. He retired in 1908. Van de Sande Bakhuyzen became member of the
Liber Amicorum H.G. van de Sande Bakhuyzen (1908) online
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(one paragraph) {{DEFAULTSORT:Sande Bakhuyzen, Hendricus G. Van De 1838 births 1923 deaths 19th-century Dutch astronomers Members of the Royal Netherlands Academy of Arts and Sciences Scientists from The Hague 20th-century Dutch astronomers
Hendricus Gerardus van de Sande Bakhuyzen (April 2, 1838, The Hague – January 8, 1923, Leiden) was a Dutch astronomer. His surname, van de Sande Bakhuyzen, is sometimes erroneously given as Backhuyzen or Bakhuysen. His first name is sometimes given as Hendrik Gerard.
He studied astronomy under Frederik Kaiser.
After he got his degree, he was a high school teacher from 1864–1867, during which time he wrote a very successful textbook on mechanics. In 1867 he became a professor at the Technical College in Delft
Delft () is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the Provinces of the Netherlands, province of South Holland, Netherlands. It is located between Rotterdam, to the southeast, ...
.
He became director of the Leiden Observatory in 1872 upon the death of Frederik Kaiser. He retired in 1908. Van de Sande Bakhuyzen became member of the Royal Netherlands Academy of Arts and Sciences
The Royal Netherlands Academy of Arts and Sciences ( nl, Koninklijke Nederlandse Akademie van Wetenschappen, abbreviated: KNAW) is an organization dedicated to the advancement of science and literature in the Netherlands. The academy is housed ...
in 1872.
He chose to concentrate on fundamental astronomy rather than on the then-new field of spectroscopy
Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter wa ...
. He worked mainly on the observation of asteroid
An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere.
...
s, but also proved the connection between a meteor shower
A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky. These meteors are caused by streams of cosmic debris called meteoroids entering Earth's atmosphere at extre ...
on November 27 and the comet 3D/Biela
Biela's Comet or Comet Biela (official designation: 3D/Biela) was a periodic Jupiter-family comet first recorded in 1772 by Montaigne and Messier and finally identified as periodic in 1826 by Wilhelm von Biela. It was subsequently observed to ...
. He also worked on geodesy
Geodesy ( ) is the Earth science of accurately measuring and understanding Earth's figure (geometric shape and size), orientation in space, and gravity. The field also incorporates studies of how these properties change over time and equivale ...
.
He edited and published the Mars drawings of Johann Hieronymus Schröter in 1881, long after the latter's death.
He married Geertruida van Vollenhoven, who died in 1910. They had two daughters and a son, Adriaan, who would be mayor of Leiden from 1927 to 1941.
His brother Ernest-Frederich van de Sande Bakhuyzen was also an astronomer who worked at the Leiden Observatory.
Bakhuysen crater (with an "s") on Mars is named for him.
References
External links
Liber Amicorum H.G. van de Sande Bakhuyzen (1908) online
(one line)
(one paragraph)
(one paragraph) {{DEFAULTSORT:Sande Bakhuyzen, Hendricus G. Van De 1838 births 1923 deaths 19th-century Dutch astronomers Members of the Royal Netherlands Academy of Arts and Sciences Scientists from The Hague 20th-century Dutch astronomers