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Proceedings of the American Academy of Arts and Sciences, Vol. 8 of 16 : From May, 1880, to June, 1881; Selected from the Records (Classic Reprint) book

Proceedings of the American Academy of Arts and Sciences, Vol. 8 of 16 : From May, 1880, to June, 1881; Selected from the Records (Classic Reprint) book

Proceedings of the American Academy of Arts and Sciences, Vol. 8 of 16 : From May, 1880, to June, 1881; Selected from the Records (Classic Reprint).cAmerican Academy of Arts and Sciences
Proceedings of the American Academy of Arts and Sciences, Vol. 8 of 16 : From May, 1880, to June, 1881; Selected from the Records (Classic Reprint)
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Author: American Academy of Arts and Sciences
Number of Pages: 506 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332064793
Download Link: Proceedings of the American Academy of Arts and Sciences, Vol. 8 of 16 From May, 1880, to June, 1881; Selected from the Records (Classic Reprint)
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Excerpt from Proceedings of the American Academy of Arts and Sciences, Vol. 8 of 16: From May, 1880, to June, 1881; Selected From the Records Let S, s = the light of the Sun and of the star expressed in stellar magnitudes by means of the scale of Pogson, in which a difference of one magnitude corresponds to the logarithmic ratio, 0.4. This ratio, expressed in numbers, is approximately 2.512. Let p = the parallax of the star in seconds of arc. The radius of the Sun equals 16' 2," and accordingly B = 1924." The value of S is more uncertain. Various determinations of the ratio of the light of the Sun to that of Sirius have been made by different observers. In 1698, Huyghens found the value 756,000,000 by reducing the light of the Sun by a minute hole. Wollaston, in 1829, compared the image of the Sun and of a lamp reflected in a silvered bulb of glass, and deduced the ratio 20,000,000,000. Steinheil, in 1836, using the Moon as an intermediate standard of comparison, gave the value 3,840,000,000. In 1861, Bond determined the relative light of the Sun andMoon by comparing their reflections in a glass globe with that of a Bengola light. Combining his measures with the comparisons of the Moon and Sirius by Herschel and Seidel, he deduced the value 5,970,500,000. In 1863, Clark found that, if the Sun was removed to 1.200,000 times its present distance and Sirius to 20 times its distance, they would appear equally bright, and equal to a sixth-magnitude star. Their ratio, consequently, equals 3,600,000,000. Reducing these measures to magnitudes, we obtain the values, Huyghens, 22.20; Wollaston, 25.75; Steinheil, 23.96; Bond, 24.44; and Clark, 23.89. The mean of all of these is 24.05, with an average deviation of 0.84. The last three agree well, and give 24.10, with an average deviation of 0.23. Probably 24.0 is not far from the truth, and may be assumed to represent this ratio as closely as it is at present known. If we adopt - 1.5 for the magnitude of Sirius, from the measures of Herschel and Seidel, we obtain for the stellar magnitude of the Sun - 25.5. 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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