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Updated: May 20, 2025
Brass parallactic rules, which revolved in azimuth above a brass horizon, twelve feet in diameter. A half sextant, of four cubits radius. A steel sextant. Another half sextant, with steel limb, four cubits radius. The parallactic rules of Copernicus. Equatorial armillaries. A quadrant of a solid plate of brass, five cubits in radius, shewing every ten seconds.
Like nearly all its congeners, the star is situated in the full stream of the Milky Way, and we learn without surprise that micrometrical measures by Burnham and Barnard failed to elicit from it any sign of parallactic shifting. It is hence certain that the development of light, of which the news reached the earth in December, 1891, must have been on a vast scale, and of ancient date.
There was also an astronomical observatory containing armillary spheres, globes, solstitial and equatorial armils, astrolabes, parallactic rules, and other apparatus then in use, the graduation on the divided instruments being into degrees and sixths. On the floor of this observatory a meridian line was drawn.
It passes the width of a weatherboard, 0.37 foot, in four minutes and thirty- seven seconds." Kennedy was talking rapidly of data which he had derived from the study of the photograph as from plumb line, level, compass, and tape, astronomical triangle, vertices, zenith, pole, and sun, declination, azimuth, solar time, parallactic angles, refraction, and a dozen other bewildering terms.
It would also be a pleasant task to investigate the properties of the gnomon of the Chinese, Egyptians, and Peruvians, the scarphie of Eratosthenes, the astrolabe of Hipparchus, the parallactic rules of Ptolemy, Regimontanus Purbach, and Walther, the sextants and quadrants of Tycho Brahe, and the modifications of these various instruments, the invention and use of which, from century to century, bringing us at last to the telescopic age, or the days of Lippershay, Jannsen, and Galileo.
Nach., No. 263 ; Pop. There is also a "parallactic" libration, depending on the earth's rotation; and a species of nodding movement the "libration in latitude" is produced by the inclination of the moon's axis to her orbit, and by her changes of position with regard to the terrestrial equator. Leo Brenner, Naturwiss. Wochenschrift, January 13, 1895; Jour. Brit. Astr.
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