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(1914) [MARC] Author: Joseph Guinchard
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’616

iv. education and mental culture.

1803) is known for his much-used table of comets, containing a list of the
older comets from 837 A. D. to 1795, together with determinations for them
when in closest proximity to the earth. J. Bredman (1770—1859) published,
in the middle of the century, a comprehensive manual on "The Principles of
Theoretical Astronomy". G. Svanberg (1802—82) did great service to Swedish
astronomical research by the erection of a new observatory at Uppsala, which
was completed in 1853. H. Schultz (1823—90) was an assiduous observer,
highly esteemed for his "Micrometrical Observations of 500 Nebulæ", for his
measurements of clusters of stars, and for his participation, on behalf of
Uppsala, in the corresponding observations of the planet Mars in 1862, for
the purpose of determining the solar parallax. N. Kr. Dunér (1839—1914),
his successor as director of the Observatory, published: "Mesures
miccromé-triques d’étoiles doubles", "Sur les étoiles à spectres de la troisième classe",
and "Sur la rotation du soleil". At the beginning of the nineties of last
century, Dunér provided the observatory with a new double refractor from
Repsold and a new dome. A new observatory was established at Lund during
the sixties, under the direction of D. M. A. Möller (1830—96), known for
his researches with regard to the Faye-Möller comet. The Stockholm
Observatory was enlarged towards the close of the seventies, after the Finnish
astronomer J. A. H. Gyldén (1841—96) had, in 1871, been appointed its director.
Gyldén devoted himself principially to the theory of perturbations and recorded
the results of bis extensive studies on this subject in a number of short essays
and in a larger work, "Traité analytique des orbites absolues des huit planètes
principales", of which two parts have been published.

The present directors of the three observatories are: Prof. Bergstrand at
Uppsala, Prof. Bohlin at Stockholm, and Prof. Charlier at Lund. Ö. Bergstrand
(b. 1873) has carried out investigations regarding the parallaxes of stars,
particularly with respect to Nova Persei, with regard to atmospheric dispersion and
on the Uranus system. Karl Bohlin (b. 1860) has published investigations
regarding the orbit of Tetys, the third satellite of Saturn, on Winecke’s comet;
on the new star Nova Persei 1901; the structure of the Milky Way; the
areo-graphy of the planet Mars; the quintic equation in connection with
investigations on the integral developments of the problem of three bodies; and has also
published "Formeln und Tafeln zur gruppenweisen Berechnung der allgemeinen
Störungen benachbarter Planeten". C. V. L. Charlier (b. 1862) has published
a-comprehensive work on Jupiter’s perturbations of Thetis, has conducted
investigations in Celestial mechanics, on the causes of the glacial epoch, theory of
probability, recent researches in optics etc., and has also published ""Vorlesungen
über die Mechanik des Himmels".

Since 1850 the Stockholm Observatory has issued its own publication,
"Astronomiska iakttagelser och undersökningar, anställda på Stockholms observatorium"
(Astronomical Observations and Investigations conducted at the Stockholm
Observatory); the Lund Observatory publishes "Meddelanden från Lunds
astronomiska observatorium" (Notices from the Lund Astronomical Observatory).

Swedish astronomers have also been appointed in foreign countries, especially
at the Observatory of Pulkova (Russia). Since 1895 the post of director of this
observatory has been held by J. O. Backlund (b. 1846), known for his
investigations on the comet Encke. The vice-directorship was also held for a time by a
Swedish astronomer, M. Nyrén (b. 1837), who has rendered service to the science
of astronomy by his determination of the so-called precession- and
aberration-constants.

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