Crommelin of Greenwich, the latter having carried the comet back to 87 B.C. with certainty, and to 240 B.C. with fair probability.
Donati analysed the light of a small comet into three bright bands.
After a rough estimate of the perturbations it must sustain from the attraction of the planets, he predicted its return for 1757,-a bold prediction at that time, but justified by the event, for the comet again made its appearance as was expected, though it did not pass through its perihelion till the month of March 1759, the attraction of Jupiter and Saturn having caused, as was computed by Clairault previously to its return, a retardation of 618 days.
He calculated an orbit for the comet of 1 759 (Halley's), reduced Lacaille's observations of 515 zodiacal stars, and was, in 1763, elected a member of the Academy of Sciences.
In her grief at the destruction of the city she plucked out her hair and was changed into a comet; in another version Electra and her six sisters had been placed among the stars as the Pleiades, and the star which she represented lost its brilliancy after the fall of Troy.
Halley's most notable scientific achievements were - his detection of the "long inequality" of Jupiter and Saturn, and of the acceleration of the moon's mean motion (1693), his discovery of the proper motions of the fixed stars (1718), his theory of variation (1683), including the hypothesis of four magnetic poles, revived by C. Hansteen in 1819, and his suggestion of the magnetic origin of the aurora borealis; his calculation of the orbit of the 1682 comet (the first ever attempted), coupled with a prediction of its return, strikingly verified in 1759; and his indication (first in 1679, and again in 1716, Phil.
But although these sometimes wander to distances considerably beyond the orbit of Neptune, it is probable that the extent of the void which separates our system from the nearest star is hundreds of times the distance of the farthest point to which a comet ever recedes.
Tebbutt's comet in 1881 was the first to be satisfactorily photographed.
It seemed to Pierre that this comet fully responded to what was passing in his own softened and uplifted soul, now blossoming into a new life.
In 1812 Bessel measured with it the angle between the components of the double star 61 Cygni and observed the great comet of 1811.
His great contribution to astronomy dates from 1866, when he showed that meteors or shooting stars traverse space in cometary orbits, and, in particular, that the orbits of the Perseids and Comet III., 1862, and of the Leonids and Comet I., 1866, were practically the same.
Schiaparelli's announcement that the orbit of the bright comet of 1862 agreed strictly with the elliptic ring formed by the circulating Perseid meteors; and three other cases of close coincidence were soon afterwards brought to light.
Sir William Huggins repeated the experiment on Winnecke's comet in 1868, Progress only with long exposures could autographic im ?'
Simon, its reputed author, and exalts him above Moses; (2) it mystically explains the Hebrew vowel points, which did not obtain till 570; (3) the compiler borrows two verses from the celebrated hymn called " The Royal Diadem," written by Ibn Gabirol, who was born about 1021; (4) it mentions the capture of Jerusalem by the crusaders and the re-taking of the Holy City by the Saracens; (5) it speaks of the comet which appeared at Rome, 15th July 1264, under the pontificate of Urban IV.; (6) by a slip the Zohar assigns a reason why its contents were not revealed before5060-5066A.M., i.e.1300-1306A.D., (7) the doctrine of the En Soph and the Sephiroth was not known before the 13th century; and (8) the very existence of the Zohar itself was not known prior 1 See, e.g., G.
In the same year he published his essay on comets, Conamen Novi Systematis Cometarum, which was occasioned by the appearance of the comet of 1680.
When the scales and position-circle of the heliometer have been set to these readings, the comet and the selected comparison-star appear together in the field of view.
This comet had been observed in 1066, and the accounts which have been preserved represent it as having then appeared to be four times the size of Venus, and to have shone with a light equal to a fourth of that of the moon.
That this should have been due to the process of dissipation does not seem possible in so short a period; we must therefore consider either that the earlier accounts are greatly exaggerated, or that the brightness of the comet is subject to changes from some unknown cause.
The known comet of shortest period bears the name of J.
As this comet is almost the only one that passes within the orbit of Mercury, it is quite possible that it alone would show the effect of such a medium.
Case of the comitia, the magistrate's purpose was to ask a question Tuttle's comet was first seen by P. F.
Cassini, the great comet of 1680 after its perihelion passage; and having returned to England, he married in 1682 Mary, daughter of Mr Tooke, auditor of the exchequer, with whom he lived harmoniously for fifty-five years.
In 1804 he calculated the orbit of Halley's comet from observations made in 1607 by Thomas Harriot, and communicated his results to H.
A masterly investigation of the comet of 1807 (Konigsberg, 1810) enhanced his reputation, and the king of Prussia summoned him, in 1810, to superintend the erection of a new observatory at Konigsberg, of which he acted as director from its completion in 1813 until his death.
As an undergraduate he became deeply interested in astronomy; he observed the comet of 1759 and the transit of Venus of June 1769, and left a quarto volume of astronomical notes.
The orbit of a newly-discovered planet or comet may be computed from three complete observations by well-known methods in a single day.
From the day when Pierre, after leaving the Rostovs' with Natasha's grateful look fresh in his mind, had gazed at the comet that seemed to be fixed in the sky and felt that something new was appearing on his own horizon--from that day the problem of the vanity and uselessness of all earthly things, that had incessantly tormented him, no longer presented itself.
To the right and high up in the sky was the sickle of the waning moon and opposite to it hung that bright comet which was connected in Pierre's heart with his love.
Gazing at the high starry sky, at the moon, at the comet, and at the glow from the fire, Pierre experienced a joyful emotion.
He wrote An Astronomical Description of the late Comet (1619); Canicularia (1648); and translated Proclus' De Sphaera, and Ptolemy's De Planetarum Hypothesibus (1620).
In 1867 the remarkable discovery was made that Tempel's comet (1866: I.) revolved in an orbit identical with that of the Leonids.
Among them were an elegant solution of the problem to determine the orbit of a comet from three observations, and memoirs on the micrometer and achromatic telescopes.