Memory of the land in Arkansas streaked across her mind like a comet, leaving a trail of questions in its wake.
There he observed the transit of Venus of 1882 and photographed the great comet of that year.
In any case the orbits of comets are exposed to such tremendous perturbations from the planets that it is unsafe from the present orbit of a comet to conjecture what that orbit may have been in remote antiquity.
When a new celestial body, say a planet or a comet is discovered, the astronomer meets with the problem of determining the orbit from several observed positions of the body.
Having removed to London, he was admitted (November 6, 1618) a licentiate of the college of physicians, and attracted notice by a publication concerning the comet of 1618.
His schooling began at Leonberg in 1577 - the year, as he himself tells us, of a great comet; but domestic bankruptcy occasioned his transference to field-work, in which he was exclusively employed for several years.
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.
Previous appearances of Halley's comet have been calculated by J.
Crommelin of Greenwich, the latter having carried the comet back to 87 B.C. with certainty, and to 240 B.C. with fair probability.
This comet has given rise to a longer series of investigations than any other, owing to Encke's result that the orbit was becoming smaller, and the revolutions therefore accelerated, by some unknown cause, of which the most plausible was a resisting medium surrounding the sun.
Faye in November 1843, the other by Francesco de Vico a year later, were minutely investigated by Leverrier, with the result of disproving the supposed identity of the first with Lexell's lost comet of 1770, and of the other with Tycho's of 1585.
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.
Hartwig in 1885, and subsequently spectroscopically examined by many observers; R Andromedae, a regularly variable star; and the Andromedids, a meteoric swarm, associated with Biela's comet, and having their radiant in this constellation (see Meteor).
Yes, a comet slamming into the planet or some galactic cataclysm could wipe us all out.
In Pierre, however, that comet with its long luminous tail aroused no feeling of fear.
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.
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.
His love for Natasha, Antichrist, Napoleon, the invasion, the comet, 666, L'Empereur Napoleon, and L'russe Besuhof--all this had to mature and culminate, to lift him out of that spellbound, petty sphere of Moscow habits in which he felt himself held captive and lead him to a great achievement and great happiness.
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.