As early as 1573, Thomas Digges had suggested that this theory should necessitate a parallactic shifting of the stars, and, consequently, if such stellar parallaxes existed, then the Copernican theory would receive additional confirmation.
The parallaxes of about fifty stars have now been repeatedly measured with such consistent results that Professor Newcomb considers them to be fairly trustworthy, and these vary from one-hundredth to three-quarters of a second.
These are sixty-nine in number; and on arranging them in the order of the amount of their parallax, I find that no less than thirty-five of them haveparallaxes between 0".
Taking the whole of the stars whose parallaxes are given by Professor Newcomb, we find that the average parallax of the thirty-one bright stars (from 3.
In order to obtain available annual parallaxes of a star it is usually necessary for the star to be nearer to us than 5 siriometers, corresponding to a parallax greater than 0″.
A wide photographic survey, by which parallaxes might be secured wholesale, has further been recommended by Kapteyn; but is unlikely to be undertaken in the immediate future.
Only spurious star-parallaxes had claimed the attention of astronomers until F.
Moreover, the absence of sensible parallaxes in the stellar heavens seemed inconsistent with its validity; and a mobile earth outraged deep-rooted prepossessions.
Knowing the distance between New York and London, and the different time of the passage, it is thus possible to calculate the difference of the parallaxes of the sun and a planet crossing its disk.
In 1751 he went to the Cape of Good Hope for the purpose of determining the sun's parallax by observations of the parallaxes of Mars and Venus, and incidentally to make observations on the other southern hemisphere stars.
The parallaxes can be determined equally well, however, if two observers are separated by exactly known distances, several hundreds or thousands of miles apart.
A definitive scale for the spectroscopic determination of absolute magnitudes has now been established, and the parallaxes and absolute magnitudes have already been derived for about 1,800 stars.
To test this relation, the spectroscopic parallaxes have been compared with the measured parallaxes in numerous instances, and an excellent agreement is shown.
So difficult and delicate is the determination of a stellar distance that only a few hundred parallaxes have been ascertained in the past century.
His catalogue of starparallaxes is the most complete and accurate yet published, and is the standard in all statistical investigations of the stars.
The parallaxes of several of them have been measured by Van Maanen: one of the very small angle 0".
The transverse velocities are formed by using the measured parallaxes to transform proper motions into linear measures.
In researches upon the distribution of the more distant stars, the method of measuring parallaxes of individual stars fails completely, and the secular parallax, or parallactic motion of the stars is employed instead.
Adams and Joy have recently determined the luminosities and parallaxes of 500 stars by this spectroscopic method.
That we find relatively large parallaxesfor some of the fainter stars, and almost no measurable parallax for some of the very bright stars is one of the riddles of the stellar universe.
Of these stars 360 have had their parallaxes previously measured; and the average difference between the spectroscopic and the trigonometric values of the parallax is only the very small angle 0".
The parallaxes found on the plates can only be relative to the general mean of all the other stars, and must therefore be negative as often as positive.
The results, in statistical form, are these: 2 stars have parallaxes between +9".
It will be understood that the negative parallaxes found for fifteen of these stars are the result of errors of observation.
Against these are to be set negative parallaxes of -0".
One of the most valuable contributions to our knowledge of stellar parallaxes is the result of Gill's work (Cape Results, vol.
The proper motions and parallaxes combined tell us the velocity of the motion of these stars across the line of sight: alpha Centauri 14.
Comparing the proper motions and parallaxes to get the actual velocity of each star relative to our system, C.
Oudemans has published a list of parallaxes observed.
Of this the purpose for which he made his collection is in itself sufficient evidence, since what may be called the differential method of parallaxes depends, as we have seen, for its efficacy upon disparity of distance.
The distances even of the few stars found to have measurable parallaxesare on a scale entirely beyond the powers of the human mind to conceive.
Parallaxes of nine southern stars measured by Gill and Elkin.
The parallaxes of perhaps a hundred stars have been determined, with greater or less precision, and a few hundred more may be near enough for measurement.
The most striking example of this is afforded by the absence of measurable parallaxes in the two bright stars, Canopus and Rigel, showing that these stars, though of the first magnitude, are immeasurably distant.
We hope, by long and repeated observations, to make a fairly approximate determination of the parallaxes of all the stars whose distance is less than twenty times that of a Centauri.
The parallaxes of which we have heretofore spoken consist in the change in the direction of a star produced by the swing of the earth from one side of its orbit to the other.
So far as measurement goes, we can only say of the distances of all the stars, except the few whose parallaxes have been determined, that they are immeasurable.
We can hardly say that the parallaxes of more than one hundred stars have been measured with any approach to certainty.
One result of this great increase of accuracy was that Pond was able at once authoritatively to discard the erroneous stellarparallaxes that had been announced by Brinkley, Royal Astronomer for Ireland.
In the same way all his researches on the parallaxes of stars were not alone for the discovery of the distance of any one or two single stars, but to gain a unit of celestial measure, by means of which the depths of space might be sounded.
Here was the discovery which came to take the place of the detection of the parallaxes of the fixed stars.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "parallaxes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
