Copernicus: An International Journal of Astronomy, Tom 3Ralph Copeland, John Louis Emil Dreyer A. Thom & Company, (Limited), 1884 |
Inne wydania - Wyświetl wszystko
Kluczowe wyrazy i wyrażenia
Alvan Clark angles Arequipa Astr astronomical autres avant Azimuth bandes beiden Beobachtungen Bestimmung bord Bredichin bright c'est calcul Calculons chromosphere chronometers Coefficienten comet comète Cometen conoïdes correction d'après daher Decl Declinationen dessin distance Double Stars equatoreal error fait feet Fehler force répulsive gleich Gleichung Gleichungen Greenwich Greenwich Mean Grössen Gürtel Heliocentric heliometer instrument j'ai Jupiter Klinkerfues können l'axe l'orbite la queue limb lines longitude mean Meridian Mollendo Nachr nahe noyau observations Observatory ondes Ordnung parallax particules périhélie planet Polhöhe position prism Professor Puno quelques queue rayon vecteur Right Ascension schon Schwedoff Schweif Sept solar Soleil spectroscope spectrum stars station Sterne Sternen Strahl Strahlen südlich südlichen Sun's Tacna telescope temperature temps théorie Transit Transit of Venus Unterschiede Uranus valeur Venus verschieden Vincocaya vitesse wenig Werth wurde Zahl Zenithdistanzen zwei
Popularne fragmenty
Strona 80 - Publications of the Washburn Observatory of the University of Wisconsin. Vol. I.
Strona 235 - A comparison of Leverrier's Tables of Uranus and Neptune with those by Newcomb of the same planets.
Strona 37 - September 9, 1872, and closed on August 9, 1875, during which time about 105,000 single observations were made. Of these the present volume contains about 13,000. The zones comprise the part of the heavens between 23° and 80° south declination, and as a security against constant errors the plan included the formation of a more accurate catalogue, containing a number of stars from each zone observed three or four times each with all possible care. The meridian circle .was constructed by Eepsold...
Strona 56 - Celestis" of the Method of mounting his Telescopes and erecting an Observatory. Reprinted from an original copy, with some Remarks. By C.
Strona 58 - ... uncertain. Our reduction shows that the intervals he designated as a period, comma, and dash, do not exceed one, two, and four tenths of a magnitude; and that the average deviation of a single comparison of two stars, expressed in magnitudes, is only 0.25. As this includes the error of our measurements of each star, the difference of each as seen by the eye from its true brightness, and the variation each has undergone during the past century, it is obvious that the errors of Herschel's observations...
Strona 113 - Schonfeld's formulae to determine the amount of the constant of precession, and to find whether this hypothetical rotation exists or not. He uses the declinations of the stars common to Lalande and Schjellerup, having first reduced Lalaude's declinations anew by von Asteu's tables. The comparison showed not only a number of deviations arising from proper motion, but, in, a number of cases, a reference to other star catalogues showed that Lalande had erred either 10".0 or 15".0. A complete list is...
Strona 88 - November 14, 15)1. 45m. The tail had a length of 30°, and was divided into two portions at the extreme end, the northern extremity curving very sharply upwards, and separated from the southern branch by a semi-circular space. The general form of the tail being very similar to the Greek character y. The southern side still remained brighter than the northern. The nucleus was much more elongated than when I observed it on November 8. The two concentrations of light which were very noticeable on that...
Strona 53 - ... small planets considered as parts of a ring around the sun. The form, position, and relative distribution of mass, should, if possible, be stated with at least so much accuracy as is judged necessary for computing its perturbing influence on planets and comets. The memoirs should be written either in Latin, French, English, German, Swedish, or Danish, and must be sent before the end of October, 1884, to the secretary of the society, Dr. HG Zeuthen, Copenhagen. They should not bear the author's...
Strona 135 - Notes on a recent Visit to some North American Observatories. By Ralph Copeland.
Strona 37 - Stars (2d ed., 1866), with a few slight modifications; the declinations are deduced from nadir observations, the latitude being assumed equal to — 31° 25' 15".0. The zones were 2° in width as far as 47° declination, thence increasing gradually with the declination ; they were generally one hundred minutes long. The transits were always observed by Dr. Gould, generally over three wires, and were registered on a chronograph, while an assistant read off one microscope, which was compared with the...