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PETER ANDREAS HANSEN (1795-1874)

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Originally appearing in Volume V12, Page 931 of the 1911 Encyclopedia Britannica.
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PETER ANDREAS See also:HANSEN (1795-1874)  , Danish astronomer, was See also:born on the 8th of See also:December 1795, at See also:Tondern, in the duchy of See also:Schleswig . The son of a See also:goldsmith, he learned the See also:trade of a watchmaker at Flensburg, and exercised it at See also:Berlin and Tondern, 1818-182o . He had, however, See also:long been a student of See also:science; and Dr Dircks, a physician practising at Tondern, prevailed with his See also:father to send him in 1820 to See also:Copenhagen, where he won the patronage of H . C . See also:Schumacher, and attracted the See also:personal See also:notice of See also:King See also:Frederick VI . The Danish survey was then in progress, and he acted as Schumacher's assistant in See also:work connected with it, chiefly at the new See also:observatory of See also:Altona, 1821-1825 . Thence he passed on to See also:Gotha as director of the Seeberg observatory; nor could he be tempted to relinquish the See also:post by successive invitations to replace F . G . W . See also:Struve at Dorpat in 1829, and F . W . See also:Bessel at See also:Konigsberg in 1847 .

The problems of gravitational See also:

astronomy engaged the See also:chief See also:part of See also:Hansen's See also:attention . A See also:research into the mutual perturbations of See also:Jupiter and See also:Saturn secured for him the See also:prize of the Berlin See also:Academy in 183o, and a memoir on cometary disturbances was crowned by the See also:Paris Academy in 185o . In 1838 he published a revision of the lunar theory, entitled Fundamenta nova investigationis, &c., and the improved Tables of the See also:Moon based upon it were printed in 1857, at the expense of the See also:British See also:government, their merit being further recognized by a See also:grant of £1000, and by their immediate See also:adoption in the Nautical See also:Almanac, and other Ephemerides . A theoretical discussion of the disturbances embodied in them (still familiarly known to lunar experts as the Darlegung) appeared in the Abhandlungen of the Saxon Academy of Sciences in 1862–1864 . Hansen twice visited See also:England and was twice (in 1842 and 186o) the recipient of the Royal Astronomical Society's See also:gold See also:medal . He communicated to that society in 1847 an able See also:paper on a long-See also:period lunar inequality (See also:Memoirs See also:Roy . See also:Asir . Society, xvi . 465), and in 1854 one on the moon's figure, advocating the mistaken See also:hypothesis of its deformation by a huge See also:elevation directed towards the See also:earth (lb. See also:xxiv . 29) . He was awarded the See also:Copley medal by the Royal Society in 185o, and his See also:Solar Tables, compiled with the assistance of See also:Christian Olufsen, appeared in 1854 . Hansen gave in 1854 the first intimation that the accepted distance of the See also:sun was too See also:great by some millions of See also:miles (See also:Month .

Notices Roy . Asir . See also:

Soc. xv . 9), the See also:error of J . F . See also:Encke's result having been rendered evident through his investigation of a lunar inequality . He died on the 28th of See also:March 1874, at the new observatory in the See also:town of Gotha, erected under his care in 1857 . See Vierteljahrsschrift astr . Gesellschaft, x . 133; Month . Notices Roy . Asir .

Society, See also:

xxxv . 168; Proc . Roy . Society, See also:xxv. p. v.; R . See also:Wolf, Geschichte der Astronomic, p . 526; Wochenschrift See also:fur Astra' nomie, xvii . 207 (See also:account of See also:early years by E . Heis) ; Allgemeine deutsche Biographie (C . Bruhns) . (A . M .

End of Article: PETER ANDREAS HANSEN (1795-1874)
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