Background
Hansen was born on December 8, 1795 in Tønder, Denmark, the son of a goldsmith.
(This book was originally published prior to 1923, and rep...)
This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.
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(Excerpt from Untersuchung Über die Gegenseitigen Störunge...)
Excerpt from Untersuchung Über die Gegenseitigen Störungen des Jupiters und Saturns Die Differentialgleichungen, Von welchen ich fur die Be rechnung der Störungen ausgegangen bin, sind diejenigen welche in der Abhandlung: Disryußitims circa tbeoriam periaröa tionam etc. In Schumach ers Astronomischen Nachrichten gegeben werden Ich transformire erstens die Di ?'erentizl gleichung für die Länge in eine andere, welche nur fur die Störungen erster Ordnung in Beziehung auf die Massen ge braucht werden kann, aber bei der Berechnung dieser Störun gen vor jener den Vorzug hat dafs sie auf mehr convergirende Reihen führt und auch weniger Arbeit verursacht, wenn die gegenseitigen Störungen zweier oder mehrerer Planeten berech net werden sollen; sie hat überdies das Merkwürdn daß sie mfser den betreffenden Di?'erentialquo tienten der Größe 9 nur die Coöfficienten der Entwickelung des Quadrats des Radius Vaters verlangt, nicht aber die Coéfficienten der Mittelpunkt. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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(This book was originally published prior to 1923, and rep...)
This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.
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(Excerpt from Darlegung der Theoretischen Berechnung der i...)
Excerpt from Darlegung der Theoretischen Berechnung der in den Mondtafeln Angewandten Störungen, Vol. 2 Allgemeine Methode zur Berechnung der in der Mondbewe gung vorhandenen Störungen sehr langer Periode. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Hansen was born on December 8, 1795 in Tønder, Denmark, the son of a goldsmith.
Hansen learned the trade of a watchmaker at Flensburg, and exercised it at Berlin and Tondern, 1818-1820. He had, however, long been a student of science; and Dr Dircks, a physician practising at Tondern, prevailed with his father to send him in 1820 to Copenhagen, where he won the patronage of H. C. Schumacher, and attracted the personal notice of King Frederick VI.
The Danish survey was in progress in 1820s, and Hansen acted as Schumacher's assistant in work connected with it, chiefly at the new observatory of Aitona, 1821-1825. Thence he passed on to Gotha as director of the Seeberg observatory; nor could he be tempted to relinquish the post by successive invitations to replace F. G. W. Struve at Dorpat in 1829, and F. W. Bessel at Konigsberg in 1847. The problems of gravitational astronomy engaged the chief part of Hansen's attention. A research into the mutual perturbations of Jupiter and Saturn secured for him the prize of the Berlin Academy in 1830, and a memoir on cometary disturbances was crowned by the Paris Academy in 1850. In 1838 he published a revision of the lunar theory, entitled Fundamenta nova investigations, &c. , and the improved Tables of the Moon based upon it were printed in 1857, at the expense of the British government, their merit being further recognized by a grant of £1000, and by their immediate adoption in the Nautical Almanac, and other Ephemerides. A theoretical discussion of the disturbances embodied in them (still familiarly known to lunar experts as the Darlegttng) appeared in the Abhandlungen of the Saxon Academy of Sciences in 1862-1864. Hansen twice visited England and was twice (in 1842 and 1860) the recipient of the Royal Astronomical Society's gold medal. He communicated to that society in 1847 an able paper on a long-period lunar inequality, and in 1854 one on the moon's figure, advocating the mistaken hypothesis of its deformation by a huge elevation directed towards the earth. He was awarded the Copley medal by the Royal Society in 1850, and his Solar Tables, compiled with the assistance of Christian Olufsen, appeared in 1854. Hansen gave in 1854 the first intimation that the accepted distance of the sun was too great by some millions of miles, the error of J. F. Encke's result having been rendered evident through his investigation of a lunar inequality. He died on the 28th of March 1874, at the new observatory in the town of Gotha, erected under his care in 1857.
(Excerpt from Untersuchung Über die Gegenseitigen Störunge...)
(This book was originally published prior to 1923, and rep...)
(This book was originally published prior to 1923, and rep...)
(Excerpt from Darlegung der Theoretischen Berechnung der i...)
Foreign member of the Royal Swedish Academy of Sciences, corresponding member of the St Petersburg Academy of Sciences