Peder horrebow (13 Ergebnisse)

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Taschenbuch. Zustand: Neu. Neuware - This scarce antiquarian book is a facsimile reprint of the original. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions that are true to the original work.…

Zustand: New. KlappentextrnrnThis scarce antiquarian book is a facsimile reprint of the original. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have.

Zustand: New. In English.

Zustand: New.

Buch. Zustand: Neu. Neuware - This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the 'public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.…

Gebunden. Zustand: New.

First edition. COPERNICUS TRIUMPHANT. First edition of one of the earliest printed works to announce stellar parallax, declaring that the Copernican system had at last been proved by observation. Drawing on Rømer's meridian records of bright stars such as Sirius and Vega-the same observational tradition that had earlier enabled Rømer to establish the finite velocity of light-Horrebow interpreted their apparent annual shifts as evidence of the Earth's orbital motion. Issued as a decisive proof of heliocentrism, it was presented as the long-sought demonstration that Copernicus had demanded and that Tycho had denied. The absence of measurable stellar parallax had been the central empirical objection to Copernicus since the sixteenth century. In De revolutionibus Copernicus himself insisted that the motion of the Earth must be accompanied by an annual displacement of the stars; he explained the lack of observed parallax by positing that the fixed stars were at an immense, almost inconceivable distance. Tycho Brahe, in contrast, argued that if the Earth moved, the stars should shift visibly, and their failure to do so was proof that the Earth remained fixed. This was not a minor quibble but the main weapon against Copernicanism. As Tycho put it in the De mundi aetherei recentioribus phaenomenis (1588), the Copernican system required stars of unimaginable size at impossible distances-an absurdity in his view. Throughout the seventeenth century the search for parallax became a constant theme in observational astronomy. The invention of the telescope offered new possibilities, but the hoped-for demonstration remained elusive. Galileo had attempted to use double-star observations, but with inadequate instruments. Robert Hooke, in his Attempt to Prove the Motion of the Earth (1674), claimed to have measured the displacement of Gamma Draconis, but the result was spurious and quickly discredited. John Flamsteed, the first Astronomer Royal, made further attempts at Greenwich but also failed. Adrien Auzout and Jean Picard in Paris worked on the problem with longer telescopes and refined meridian instruments, without success. The persistence of these efforts shows how urgent the parallax question remained: heliocentrism could be argued on grounds of simplicity, physics, or elegance, but only a demonstration of parallax would supply the irrefutable geometrical proof. It was into this tradition that Horrebow's Copernicus triumphans entered. A pupil and later successor of Ole Rømer, Horrebow inherited not only his master's instruments but also his methods. Rømer had pioneered the use of transit instruments, perfecting meridian observations with telescopic sights. More famously, he had used the timings of Jupiter's satellite eclipses to infer the finite velocity of light, announcing the result in 1676. By the early eighteenth century his methods were a model of precision observational practice. Horrebow, steeped in this tradition, turned to Rømer's meridian records of bright stars in the hope of finding the parallax that Copernicus required and Tycho had denied. The treatise, printed in 1727 at Horrebow's own expense, is short but confident. He points to the annual displacements of Sirius and Vega, interprets them as parallactic, and concludes that the Copernican system has at last been demonstrated. Dedicated to the Crown Prince, the work has a ceremonial as well as scientific tone: it was not just a technical claim but a public assertion that the long-standing controversy was resolved. As Houzeau and Lancaster record, it is among the earliest printed attempts to prove the Earth's motion by stellar parallax (HL 12741). The displacements were real but misinterpreted. In 1729 James Bradley, observing with Samuel Molyneux, announced to the Royal Society his discovery of the aberration of light. Each star, he showed, describes a small ellipse in the sky over the course of a year, not because of parallax but because of the combination of the finite speed of light.…

Leipzig, Gleditsch & Grossius, 1736. 4to. No wrappers. In: "Nova Acta Eruditorum", Anno 1736, No. III (September March issue). Pp. 97-144 (entire issue ofefred). The review-paper: pp. 123-127 and 1 engraved plate showing Ole Roemer observing with one of his large instruments. Wide-margines. Some brownspots. Roemers astronomical instruments were the best of his time. In the work by Peder Horrebow, Roemer's pupil and successor as professor in astronomy in Copenhagen, here reviewed, describes the instruments in detail as well as Roemer's observational methods.…

Hafniæ (Copenhagen), Lynowii, 1748. 4to. In a nice contemporary Cambridge-style mirror binding with five raised bands and richly gilt spine. Small paper-label pasted on to top of spine. Light wear to extremities, a few small holes to boards. Head of spine with loss of leather, showing headbands. Internally fine and clean. Printed on good paper with wide marginse. 206, (2) pp. Rare first edition of Horrebow?s textbook on natural philosophy with a focus on astronomy. When young Horrebow had intensively studied Casper Bartholin?s work ?Specimen philosophiae naturalis? and wanted to revise and possibly expand it:?When during the period 1747-53 the ageing professor of astronomy, Peder Horrebow, held the chair of physics, too, he felt the need for revising the praiseworthy ?Specimen?, the 56 years old, from which he had himself in his youth acquired his knowledge of natural philosophy. And after having in vain tried to comment upon the ?specimen? and to change its text as well as its ordering of subjects he finally produced a completely new text-book [The present].? (Dobrzycki, The Reception of Copernicus? Heliocentric Theory). …

N.C. Høpffner, København 1774. Lille smal 8vo. (66) sider. Kalenderdelen med indskudte blanke blade. Titelbladet trykt med rødt og sort og med træskåret vignet af Rundetårn. Indbundet med 1.: LISTE paa Admiralitets og Commissariats Collegii Höie Herrer Deputerede samt paa de i Hans Kongl. Majestæts Söe-Tieneste staaende Flagmænd og Officierer for Aar 1774. Udgiven af Søren Hansen. (24) sider + 2: ROULLE paa Söe-Cadet-Compagniet før Aar 1774. (10) sider. Med træskåret gengivelse af Christían VII's monogram. Samtidigt papirbind udført af grønt tapet. Samtidigt udskåret fuglesilhouet på forpermen. Ryggen slidt. Samtidige notater på de indskudte blade samt i de to tillæg. Lidt plettet. * Yderst sjælden. De to tillæg udgør en oversigt over den dansk-norske fællesflådes officerskorps og -aspiranter.…

Kjøbenhavn, S. Poulsen, 1796. Samtidigt hldrbd. Rygforgyldning. Forgyldt titeletiket. Øverste kapitæl slidt. Kobberstukket titel (Thorvaldsen del. - Flink sc.). XVI,239 pp. originaltrykket. - Bibl. Dan.I,1091.

Kiøbenhavn, Høppfner, 1750. 8vo. In a modest contemporary half calf binding, with considerably wear. Verso on front board annotated in pencil. Internally nice and clean. 90, (6) pp. + 2 folded plates (Not mentioned in Biblioteca Danica). Rare first edition of Horrebow's textbook on astronomy. ?(Horrebow) was a personal assistant to Ole Römer for four years. In 1714 he was made professor at the university and director of the observatory he held this position for fifty years, although two of his sons had to take care of his professional duties during his last years. He was a member of the academies of Copenhagen, Berlin, and Paris. Horrebow?s scientific life was shaped by two major influences. The first was his daily association during his youth with Römer, of whom Horrebow later spoke with the greatest devotion. Second, in the great fire in Copenhagen in 1728 nearly all of Römer?s papers and unpublished observations were destroyed together with Horrebow?s own observations" and from that time on it remained a matter of personal honor for Horrebow to describe fully Röer?s scientific achievements in order to preserve them for posterity. Throughout his lifetime Horrebow was a fertile author. He wrote several textbooks on astronomy, mathematics, and navigation which had a considerable influence at the university and at Danish schools." (DSB) Biblioteca Danica II, 65 (does not mention the two plates present here). …