Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 17, 2025
He measured the obliquity of the ecliptic, and agreed with Eratosthenes. He altered the length of the tropical year from 365 days, 6 hours to 365 days, 5 hours, 53 minutes still four minutes too much.
The course of the moon and planets was determined with reference to the sun's ecliptic, and gradually a zodiacal system was evolved, the perfection of which is best exemplified by the fact that so much of the astronomical language of the present time is the same as that used by the ancient astronomers of the Euphrates Valley.
But obviously, since my course lay generally in the plane of the ecliptic, and for the present at least nearly in the line joining the centres of the Earth and Sun, it was desirable that my real journey into space should commence in the plane of the midnight meridian; that is, from above the part of the Earth's surface immediately opposite the Sun.
It was after tea on a summer evening, and the conversation, which had roamed in a desultory, spasmodic fashion from golf clubs to the causes of the change in the obliquity of the ecliptic, came round at last to the question of atavism and hereditary aptitudes. The point under discussion was, how far any singular gift in an individual was due to his ancestry and how far to his own early training.
A comparison which he instituted between the results of his formula and an ancient observation recorded in the Chinese Annals exhibited a most satisfactory accordance. The observation in question indicated the obliquity of the ecliptic for the year 1100 before the Christian era, to be 23° 54' 2".5.
If Captain Servadac had been more deeply versed in astronomy, he would perhaps have been able to bring to bear his knowledge that if the axis of the earth, as everything seemed to indicate, now formed a right angle with the plane of the ecliptic, her various seasons, like those of the planet Jupiter, would become limited to certain zones, in which they would remain invariable.
For 164 years, then, after Galileo first levelled his telescope at the setting sun, next to nothing was learned as to its nature; and the facts immediately ascertained, of its rotation on an axis nearly erect to the plane of the ecliptic, in a period of between twenty-five and twenty-six days, and of the virtual limitation of the spots to a so-called "royal" zone extending some thirty degrees north and south of the solar equator, gained little either in precision or development from five generations of astronomers.
There are other planets in this system, all of them more or less conforming to the plane of the ecliptic. Anvhar is obviously a rogue, perhaps a captured planet of another sun. For the greatest part of its 780-day year it arcs far out from its primary, in a high-angled sweeping cometary orbit.
He had before suggested, as is supposed, to Ptolemy Euergetes, to make him the two great copper armillae, or circles for determining the equinox, which stood for centuries in "that which is called the Square Porch" probably somewhere in the Museum. By these he had calculated the obliquity of the ecliptic, closely enough to serve for a thousand years after. That was one work done.
Moreover, the great precessional period, in which the earth's axis gyrates like that of some mighty top around the perpendicular to the ecliptic, was communicated to the builders with a degree of accuracy far exceeding that of the best modern determinations, and they were instructed to symbolise that relation in the dimensions of the pyramid's base.
Word Of The Day
Others Looking