But there is one instrument of great value, the heliometer, which is not used at Greenwich.    From Wordnik.com.  [History of Astronomy] Reference

A heliometer is the most accurate astronomical instrument for relative measurements of position, as a transit circle is the most accurate for absolute determinations.    From Wordnik.com.  [Pioneers of Science] Reference

Joseph Fraunhofer perfected the refracting telescope, as Herschel had perfected the reflector, and invented a wonderfully accurate "heliometer," or sun-measurer.    From Wordnik.com.  [A History of Science: in Five Volumes. Volume III: Modern development of the physical sciences] Reference

Munich, who constructed a magnificent heliometer for the Observatory at.    From Wordnik.com.  [The Astronomy of Milton's 'Paradise Lost'] Reference

The heliometer, there can be no doubt, is the special instrument for the purpose, and it was, moreover, that employed by.    From Wordnik.com.  [Scientific American Supplement, No. 623, December 10, 1887] Reference

Its aperture is of only six inches, while that of the Oxford heliometer is of seven and a half; but the perfection of the arrangements adapting it to the twofold function of equatorial and micrometer stamps it as a model not easy to be surpassed.    From Wordnik.com.  [Scientific American Supplement, No. 623, December 10, 1887] Reference

Bessel to be put to the question with his heliometer, while Struve made.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

These two traditional methods were supplemented in 1874 by the camera and the heliometer.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

Fraunhofer, moreover, constructed for the observatory at Königsberg the first really available heliometer.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

The transit instrument, the meridian circle, the mural circle, the heliometer, and the sextant, belong to this class.    From Wordnik.com.  [The Uses of Astronomy An Oration Delivered at Albany on the 28th of July, 1856] Reference

These require extension, because the differential methods of the heliometer and the camera cannot otherwise be made absolute.    From Wordnik.com.  [History of Astronomy] Reference

They frequently recur; they need no elaborate preparation; a single astronomer armed with a heliometer can do all the requisite work.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

Queensland to Bermuda; the Americans collected a whole library of photographs; the Germans and Belgians trusted to the heliometer; the.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

Here he constructed the famous "Dorpat refractor" for Struve, which is still at work; and designed the "Königsberg heliometer" for Bessel.    From Wordnik.com.  [Pioneers of Science] Reference

In 1877 Sir David Gill used Lord Crawford's heliometer at the Island of Ascension to measure the parallax of Mars in opposition, and found the sun's distance 93,080,000 miles.    From Wordnik.com.  [History of Astronomy] Reference

He considered that, while the superiority of the heliometer had been proved, the results would be still better with the points of light shown by minor planets rather than with the disc of Mars.    From Wordnik.com.  [History of Astronomy] Reference

Erastus Corning, Esq. The center of this hall is occupied by a massive pier of stone, 10 feet square, passing from the basement into the dome above, and intended for the support of the great heliometer.    From Wordnik.com.  [The Uses of Astronomy An Oration Delivered at Albany on the 28th of July, 1856] Reference

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.    From Wordnik.com.  [The New Heavens] Reference

He has, at least, succeeded in measuring the angle at the eye that Betelgeuse subtends, so that after estimating its parallax as given by a heliometer, it's merely a matter of trigonometry to work out the size of the star.    From Wordnik.com.  [The Prairie Child] Reference

The position of this interesting double he compared with two other stars which were seen simultaneously in the field of the heliometer, by the method I have described, throughout the whole year 1838; and in the last month of that year he was able to announce with confidence a distinct though very small parallax; substantiating it with a mass of detailed evidence which commanded the assent of astronomers.    From Wordnik.com.  [Pioneers of Science] Reference

1837 Bessel's application of the heliometer to measurements of stellar parallax.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

Bessel's result with the heliometer.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

Cape heliometer, 416.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference

1829 The Königsberg heliometer mounted.    From Wordnik.com.  [A Popular History of Astronomy During the Nineteenth Century Fourth Edition] Reference