Now showing items 1-20 of 115

    • The Accuracy of Oppolzers Eclipse Maps 

      Rigge, William F., S.J. (1926)
      First Paragraph: | There is a very general misconception of the accuracy of Oppolzer’s eclipse maps. This astronomer, as is well known, published in 1885 that immortal work entitled "Canon der Finsternisse,” which gives ...
    • The Annular Eclipse of the Sun of 1919 November 22 as Visible in the United States and Partial Eclipse of the Moon 1919 November 7 

      Rigge, William F., S.J. (1919)
      THE ANNULAR ECLIPSE OF THE SUN | Except in the Pacific states, the annular eclipse of the sun of 1919 November 22 will be visible to a greater or less extent all over the United States. The accompanying maps will probably ...
    • The Apparent Path of Halley's Comet in the Sky 

      Rigge, William F., S.J. (1910)
      First Paragraph: | Halley’s comet, as we know, moves in a very elongated ellipse. While its farthest excursions carry it beyond the outermost planet of our system, its nearest approach to the Sun is almost half of our ...
    • The Astronomical Observatory 

      Rigge, William F., S.J. (1912)
      A list of facts related to Creighton's Observatory regarding the building, location, scientific instruments, and national recognition. Published by Creighton University
    • Astronomical Panoramic Views From a City Observatory 

      Rigge, William F., S.J. (1914)
      First Paragraph: | The astronomical panoramic views presented in this article were taken for the purpose of teaching students the circles of the celestial sphere and the magnitude of circular measure. They consist of a ...
    • Astronomy 

      Rigge, William F., S.J. (1900)
      First Paragraph: | Creighton University offers its students facilities in the study of practical Astronomy that are surpassed by few institutions in the country. The Observatory that it places at their command is of the ...
    • A Chinese Star Map Two Centuries Old 

      Rigge, William F., S.J. (1915)
      First Paragraph: | A Chinese star map two centuries old is indeed a curiosity. It is to be found in the latest volume of the Annals of Zo-Se Observatory, in Zi-Ka-Wei, near Changhai, in China, which was distributed recently. ...
    • The Columbus Eclipse 

      Rigge, William F., S.J. (1923)
      First Paragraph: | In Windsor's “Christopher Columbus” on page 465 the following incident is related. | “Columbus now resorted to an expedient characteristic of the ingenious fertility of his mind. His astronomical tables ...
    • Concerning a New Method of Tracing Cardioids 

      Rigge, William F., S.J. (1919)
      First Paragraph: | A cardioid may under certain conditions be traced by a point when its motion is the resultant of a rectilinear simple harmonic movement and a uniform angular one of the same period. The harmonic motion ...
    • Cosmic Clouds 

      Rigge, William F., S.J. (1922)
      First Paragraph: | In this age of large telescopes that are all exclusively photographic and devoted to the detailed analysis of the heavenly bodies, it would seem that visual observations and comprehensive surveys had ...
    • Cuspidal Envelope Rosettes 

      Rigge, William F., S.J. (1922)
      First Paragraph: | A point P moves in the line segment EG, Fig. 1, with simple harmonic motion of p cycles, while this segment makes q revolutions about A with uniform angular speed. Moritz has exhaustively treated the ...
    • Cuspidal Rosettes 

      Rigge, William F., S.J. (1919)
      First Paragraph: | The rose, rosette, rosace, Rosenkurve or multifolium, or whatever other name it may have, is a periodic polar curve whose equal sectors may have any angular magnitude. Its general equation, as usually ...
    • Dates of Easter for Two Thousand Years 

      Rigge, William F., S.J. (1907)
      First Paragraph: | Whenever we take up the calendar of a new year our first inquiry is concerning the date of Easter, since its position regulates the dates of all the movable feasts of the year. This is as it ought to be.
    • The Demon Star 

      Rigge, William F., S.J. (1913)
      First Paragraph | In the northern heavens, visible in the United States on almost any night of the year, there is a famous star that the Arabians named Al Gol, the Demon Star. While all the myriads of fixed stars glowed ...
    • Does the Earth Really Go Round the Sun? 

      Rigge, William F., S.J. (1915)
      First Paragraph: | Deep down in the recesses of some minds, there may be perhaps a lurking suspicion, that the earth’s going around the sun at the distance of about 93,000,000 miles may be, after all, only a theory, and ...
    • Double Star Systems 

      Rigge, William F., S.J. (1913)
      First Paragraph: | The continual increase in the number and size and perfection of astronomical instruments, together with the progress in the skill of men that use them and study and measure and discuss their results, are ...
    • The Driving Clock and the Clamp and Slow-Motion Screw of an Equatorial 

      Rigge, William F., S.J. (1912)
      First Paragraph: | Providing an equatorial telescope with an efficient driving clock, and bringing the clamp and slow-motion screws on both axes down to the eyepiece, appear to be so exclusively the work of a professional ...
    • The Eclipse Expedition of the Creighton University to Washington Georgia 

      Rigge, William F., S.J. (1901)
      First Paragraph: | Creighton University has contributed its share towards the scientific observation of the total solar, eclipse of May 28, 1900, so far as its means and circumstances permitted. As this great event occurred ...
    • The Eclipses of 1905 

      Rigge, William F., S.J. (1905)
      First Paragraph: | Of the two solar and two lunar eclipses occur ring in the course of the year 1905, one of each class will be more or less visible in the United States.
    • The Eclipses of 1906 

      Rigge, William F., S.J. (1906)
      First Paragraph: | During the year 1906 there will be three partial eclipses of the sun and two total eclipses of the moon. One of each class will be visible in the United States.