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Updated: May 11, 2025
The heliometer parallax is doubtless less reliable than the photographic ones, and Doctor Adams states that the spectral type and luminosity of Betelgeuse make his value less certain than in the case of most other stars.
The heroine, we are told, “if she inherited her father’s pride of birth and her mother’s beauty of person, had in herself a tone of enthusiastic feeling that, perhaps, belongs to her age even in the lowly born, but which is refined into the high spirit of wild romance only in the far descended, who feel that it is their best inheritance.” This enthusiastic young lady, by dint of reading the newspaper to her father, falls in love with the prime minister, who, through the medium of leading articles and “the resumé of the debates,” shines upon her imagination as a bright particular star, which has no parallax for her living in the country as simple Miss Wyndham.
"Not I. I saw her with my two eyes." "Notwithstanding the different planes of their orbits," suggested Richter. "Yes, notwithstanding the fact that I can get a parallax to any of the fixed stars in a moment, with only the breadth of my nose for the base," answered Heinrich, responding at once to the fun, and careless of the personal defect insinuated.
The absence of annual parallax further involves an incredible distance between the outermost planet and the fixed stars. We are bound to admit that in the circumstances of the case, so long as there was no question of dynamical forces connecting the members of the solar system, his reasoning, as we should expect from such a man, is practical and sound.
With its companion, it revolves round their common centre of gravity in eighty-one years, and hence it would seem that their conjoint mass is less than that of the sun. The star 61 Cygni is of the sixth magnitude. Its parallax was first found by Bessel in 1838, and is about one-third of a second. The distance from us is, therefore, much more than five hundred thousand times that of the sun.
A sermon by a lay-preacher may be worth listening I replied, calmly. It gives the parallax of thought and feeling as they appear to the observers from two very different points of view. If you wish to get the distance of a heavenly body, you know that you must take two observations from remote points of the earth's orbit, in midsummer and midwinter, for instance.
But his activity was not solely occupied with the promotion of a comprehensive reform in astronomy; it embraced special problems as well. The long-baffled search for a parallax of the fixed stars was resumed with fresh zeal as each mechanical or optical improvement held out fresh hopes of a successful issue. Illusory results abounded.
And many of the Plymouth folk went away from the Hoe that morning, and from the second lecture, in which Parallax triumphantly quoted the results of the observation, with the feeling which had been expressed seven years before in the 'Leicester Advertiser, that 'some of the most important conclusions of modern astronomy had been seriously invalidated. If our books of astronomy, in referring to the effects of the earth's curvature, had only been careful to point out how surveyors and sailors and those who build lighthouses take into account the modifying effects of atmospheric refraction, and how these effects have long been known to vary with the temperature and pressure of the air, this mischief would have been avoided.
Our astronomy is full of examples of calling in the aid of these magnificent helpers. Thus, on a planet so small as ours, the want of an adequate base for astronomical measurements is early felt, as, for example, in detecting the parallax of a star.
What is needed in order to attain knowledge of the desired exactness is no less than this: to measure an angle about equal to that subtended by a halfpenny 2,000 feet from the eye, within a little more than a thousandth part of its value. The angle thus represented is what is called the "horizontal parallax" of the sun.
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