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Resolved Astrometric Binary Stars Brian D. Mason
Resolved Astrometric Binary Stars Brian D. Mason 9/12/2012 U.S. Naval Observatory 1 Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) U.S. Naval Observatory Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) •Non-linear proper motion of Sirius and Procyon (1844) Image: http://vega.lpl.arizona.edu/sirius/A5.html U.S. Naval Observatory Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) •Non-linear proper motion of Sirius and Procyon (1844) Due to stellar types (main- sequence and white dwarf) motion affect significant, but Image: http://vega.lpl.arizona.edu/sirius/A5.html companion hard to detect. • Sirius B first resolved in 1862 by Alvan Graham Clark (right) testing 18.5 ” Clark refractor. U.S. Naval Observatory Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) •Non-linear proper motion of Sirius and Procyon (1844) Due to stellar types (main- sequence and white dwarf) motion affect significant, but companion hard to detect. • Sirius B first resolved in 1862 by Alvan Graham Clark (right) testing 18.5 ” Clark refractor. • Procyon B first resolved in 1896 by John Martin Schaeberle with Lick 36 ” Clark refractor. U.S. Naval Observatory CurrentCurrent Orbit: Orbit: Procyon Sirius AB AB • Broken line is line of nodes. • Green plus signs and asterisks: micrometry. • Pink asterisks: photography • Blue circles: HST/WFPC2 • Scales on axis are in arcseconds. • Direction of orbital motion at lower right. • Sirius Period = 50.090y. • Procyon Period = 40.82y. U.S. Naval Observatory Orbits • The 6 th Catalog of Orbits of Visual Binary Stars has 2298 orbits of 2187 systems. -
Essays-Mechanics / Electrodynamics/Download/8831
WHAT IF THE GALILEO AFFAIR NEVER HAPPENED? ABSTRACT From the 5th Century A.D. to the advent of Scholastic Aristotelianism, the curriculum in Roman Catholic universities in Europe taught a Rotating Geocentric Earth. St. Thomas Aquinas (1225 A.D.-1274 A.D.) introduced the writings of Aristotle (384 B.C.-322 B.C.) and of Claudius Ptolemy (100 A.D.-170 A.D.) in the 13th Century A.D., and the curriculum changed to teach a Non-Rotating Geocentric Earth. In this GSJ presentation, an Alternate History is presented. The famous Trial of Galileo never happened and the book by Nicolaus Copernicus was never banned by the Vatican of the Roman Catholic Church. The Roman Catholic Church simply ignored Galileo & his insulting book of 1632 A.D. The Roman Catholic Church Astronomers produced the Gregorian Calendar in 1583 A.D. The Roman Catholic Astronomers had abandoned the Aristotle/Ptolemy Model of Astronomy and had replaced it with the Non-Rotating Tychonian Model. This is NOT Alternate History. Johann Kepler published. That is NOT Alternate History. Isaac Newton published Principia, too. Christian Huygens contributed to the technology of the Mechanical Clock. Mechanical Time and Sundial Time demonstrate two similar but not identical paths. This is NOT Alternate History, either. The writer that is known as Voltaire (1694-1778) campaigned for Newton’s Principia as did Willem Gravesande (1688-1742). Pierre-Simon LaPlace (1748-1827) rescued Newton’s Celestial Mechanics of Universal Gravitation and Kepler’s Elliptical Orbits from disequilibrium issues in 1804A.D. Friedrich Bessel (1784-1846) discovered the first star to exhibit Stellar Parallax in 1838. -
Department of Statistics, UCLA
UCLA Department of Statistics, UCLA Title Determination of the Accuracy of the Observations, by C. F. Gauss, Translation with preface Permalink https://escholarship.org/uc/item/4n21q6bx Author Ekström, Joakim Publication Date 2013-11-12 eScholarship.org Powered by the California Digital Library University of California Determination of the Accuracy of the Observations by Carl Friedrich Gauss. Translation by Joakim Ekström, with preface. Af«±§Zh±. Bestimmung der Genauigkeit der Beobachtungen is the second of the three major pieces that Gauss wrote on statistical hypothesis generation. It continues the methodological tradition of eoria Motus, producing estimates by maximizing probability density, however absence of the change-of- variables theorem causes technical diculties that compromise its elegance. In eoria Combinationis, Gauss abandoned the aforementioned method, hence placing Bestimmung der Genauigkeit at a cross- roads in the evolution of Gauss’s statistical hypothesis generation methodology. e present translation is paired with a preface discussing the piece and its historical context. Õ ó Translator’s Preface and Discussion by Joakim Ekström, UCLA Statistics Carl Friedrich Gauss (Õßßß-Õ¢¢) published three major pieces on statistical hypothesis generation: eoria Motus (ÕþÉ), Bestimmung der Genauigkeit (ÕÕä) and eoria Combinationis (ÕóÕ) (see Sheynin, ÕÉßÉ). eoria Motus was translated into English by C. H. Davis in Õ¢, eoria Combina- tionis was translated into English by G. W. Stewart in ÕÉÉ¢, but an English translation of Bestimmung der Genauigkeit has, in spite of great eorts, not been found in the literature. Hence the present translation. Bestimmung der Genauigkeit der Beobachtungen, as its complete title reads, is an interesting histor- ical text for many reasons. -
Thinking Outside the Sphere Views of the Stars from Aristotle to Herschel Thinking Outside the Sphere
Thinking Outside the Sphere Views of the Stars from Aristotle to Herschel Thinking Outside the Sphere A Constellation of Rare Books from the History of Science Collection The exhibition was made possible by generous support from Mr. & Mrs. James B. Hebenstreit and Mrs. Lathrop M. Gates. CATALOG OF THE EXHIBITION Linda Hall Library Linda Hall Library of Science, Engineering and Technology Cynthia J. Rogers, Curator 5109 Cherry Street Kansas City MO 64110 1 Thinking Outside the Sphere is held in copyright by the Linda Hall Library, 2010, and any reproduction of text or images requires permission. The Linda Hall Library is an independently funded library devoted to science, engineering and technology which is used extensively by The exhibition opened at the Linda Hall Library April 22 and closed companies, academic institutions and individuals throughout the world. September 18, 2010. The Library was established by the wills of Herbert and Linda Hall and opened in 1946. It is located on a 14 acre arboretum in Kansas City, Missouri, the site of the former home of Herbert and Linda Hall. Sources of images on preliminary pages: Page 1, cover left: Peter Apian. Cosmographia, 1550. We invite you to visit the Library or our website at www.lindahlll.org. Page 1, right: Camille Flammarion. L'atmosphère météorologie populaire, 1888. Page 3, Table of contents: Leonhard Euler. Theoria motuum planetarum et cometarum, 1744. 2 Table of Contents Introduction Section1 The Ancient Universe Section2 The Enduring Earth-Centered System Section3 The Sun Takes -
Astrometry and Optics During the Past 2000 Years
1 Astrometry and optics during the past 2000 years Erik Høg Niels Bohr Institute, Copenhagen, Denmark 2011.05.03: Collection of reports from November 2008 ABSTRACT: The satellite missions Hipparcos and Gaia by the European Space Agency will together bring a decrease of astrometric errors by a factor 10000, four orders of magnitude, more than was achieved during the preceding 500 years. This modern development of astrometry was at first obtained by photoelectric astrometry. An experiment with this technique in 1925 led to the Hipparcos satellite mission in the years 1989-93 as described in the following reports Nos. 1 and 10. The report No. 11 is about the subsequent period of space astrometry with CCDs in a scanning satellite. This period began in 1992 with my proposal of a mission called Roemer, which led to the Gaia mission due for launch in 2013. My contributions to the history of astrometry and optics are based on 50 years of work in the field of astrometry but the reports cover spans of time within the past 2000 years, e.g., 400 years of astrometry, 650 years of optics, and the “miraculous” approval of the Hipparcos satellite mission during a few months of 1980. 2011.05.03: Collection of reports from November 2008. The following contains overview with summary and link to the reports Nos. 1-9 from 2008 and Nos. 10-13 from 2011. The reports are collected in two big file, see details on p.8. CONTENTS of Nos. 1-9 from 2008 No. Title Overview with links to all reports 2 1 Bengt Strömgren and modern astrometry: 5 Development of photoelectric astrometry including the Hipparcos mission 1A Bengt Strömgren and modern astrometry .. -
Rabbi Reuven Landau and the Jewish Reaction to Copernican Thought in Nineteenth Century Europe
JEREMY BROWN Rabbi Reuven Landau and the Jewish Reaction to Copernican Thought in Nineteenth Century Europe n the opening years of this century, Rabbi Shlomo Benizri, once Israel’s Minister of Labor and Social Affairs, published a comprehen- sive textbook on the Jewish calendar titled Ha-shamayim Mesapperim I 1 (The Heavens Proclaim). Most of R. Benizri’s work covers the complex mathematical and astronomical foundations which determine the struc- ture of the lunar based Jewish calendar, and the last part of the book describes the nature of the solar system. In this last section, R. Benizri concludes that despite nearly five hundred years of scientific and astro- nomical evidence to the contrary, it is the sun that revolves around the earth, not vice-versa. Although R. Benizri was educated in traditional Orthodox yeshivot and never attended university, his book made use of many modern scientific instruments and discoveries. It reproduced high resolution telescopic images of the surface of the planets (including those sent from the famous Viking 1 Project) and described the composition of the atmosphere and surface of the planets using data from NASA’s solar explorations. And yet, after a lengthy analysis, R. Benizri stated that the earth does not orbit the sun, because, in his account, the Bible, the rabbis of the Talmud and their medieval commentators had all concluded that the earth lay at the center of the universe. JEREMY BROWN, M.D., is Associate Professor and Director of Research in the Department of Emergency Medicine at the George Washington University in Washington, D.C. -