An Historical Account of the Origin and Progress of Astronomy: With Plates Illustrating, Chiefly, the Ancient SystemsBaldwin and Cradock, 1833 - 520 Seiten |
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Seite 53
... angles would fall in all the twelve signs . To these tri- gons were given the names and qualities of the four elements : thus the first , formed by Aries , Leo , and Sagittarius , was called the trigon of fire ; the second , formed by ...
... angles would fall in all the twelve signs . To these tri- gons were given the names and qualities of the four elements : thus the first , formed by Aries , Leo , and Sagittarius , was called the trigon of fire ; the second , formed by ...
Seite 78
... angle between these lines , which is that sub- tended by the diameter of the sun , since the apparent diurnal movement of the luminary is then in the plane of the equator , being compared with the angle made by two shadows of the gnomon ...
... angle between these lines , which is that sub- tended by the diameter of the sun , since the apparent diurnal movement of the luminary is then in the plane of the equator , being compared with the angle made by two shadows of the gnomon ...
Seite 79
... angles were invented , but we have proofs that the Chaldeans , Egyptians and Hindus had attempted so to divide that zone ; and , from a coincidence in the nature of the divisions , if we leave out the improbable statement of Servius ...
... angles were invented , but we have proofs that the Chaldeans , Egyptians and Hindus had attempted so to divide that zone ; and , from a coincidence in the nature of the divisions , if we leave out the improbable statement of Servius ...
Seite 81
... angles to the former , might be determined in a similar manner . The colures would thus pass through the middle of the dodecatemories , and it appears that such were the situations assigned them by the Chaldeans and Egyptians ; the same ...
... angles to the former , might be determined in a similar manner . The colures would thus pass through the middle of the dodecatemories , and it appears that such were the situations assigned them by the Chaldeans and Egyptians ; the same ...
Seite 84
... angle , and finding how often it could be in- scribed in the circumference of the whole circle . The differ- ence between the two angles taken on the days when the sun's shadow was the greatest and the least , which is the measure of ...
... angle , and finding how often it could be in- scribed in the circumference of the whole circle . The differ- ence between the two angles taken on the days when the sun's shadow was the greatest and the least , which is the measure of ...
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Häufige Begriffe und Wortgruppen
according Almagest ancient angle apogeum appear apsides Arabians ascertained ascribed assigned astronomer attraction axis Bailly cause celestial bodies centre Chaldeans Christ circle circumference coincide comets commencement computed consequently considered constellation Copernicus degrees described determined diameter direction earth eccentric ecliptic Egypt Egyptians elements epicycle epoch equal equator equinoctial points equinox Eudoxus fixed stars formed former gnomon Greeks heavens heliacal heliacal rising Hindus Hipparchus horizon hypothesis inequalities inferior planets instruments interval Jupiter Kepler known latitude latter length longitude luminary lunar mean distance mean motion mentioned Mercury meridian moon's movements nearly Newton nodes obliquity observations obtained opinion orbit parallax period phenomena philosopher planetary planets Plutarch pole precession probably Ptolemy respect retrograde revolution revolve right ascension rising Saturn shew shewn sidereal solar solstice sphere sun and moon sun's superior planets supposed surface theory tion Tycho Brahe variations velocity Venus vernal equinox zodiac
Beliebte Passagen
Seite 500 - A prodigious number of physical phenomena are perceived to follow as necessary consequences from Newton's grand law, that bodies tend toward each other with a force varying inversely as the square of the distance and directly as the mass of the bodies. But we should reach a higher unity and obtain a deeper insight into nature did we know not merely the empirical fact that bodies do so, but the cause why they do so. It is this which incites in the rational physicist the desire to find out the cause...
Seite 30 - Who knows exactly, and who shall in this world declare, whence and why this creation took place ? The gods are subsequent to the production of this world: then who can know whence it proceeded ? or whence this varied world arose ? or whether it uphold [itself], or not ? He who, in the highest heaven, is the ruler of this universe, does indeed know; but not another can possess that knowledge.
Seite 512 - ¡mother, and so contrary to the ideas which had been formed respecting the figure of the terrestrial globe, would seem to indicate great irregularity ; and as there can be little doubt of the accuracy of...
Seite 102 - A solar day is the interval between two successive returns of the sun to the same meridian. The sun moves through 360 degrees of longitude in one tropical year, or 365 days, 5 hours, 48 minutes, and 47 sec« onds. Hence the sun's mean daily motion in longitude is found by the proportion One year : one" day : : 360° : 59
Seite 100 - ... so far as we know, be independent of every other ; for it is only in virtue of each being supposed to be an ultimate property or to point to an ultimate property that it has any claim to be taken into the account. Thus, if any two of the properties are found to be joint effects of the same cause or to stand to each other in the relation of cause and effect, they furnish only one argument instead of two.
Seite 93 - Die iam illustri signum e tabernaculo regis bucina dabatur. Super tabernaculum, unde ab omnibus conspici posset, imago solis crystallo inclusa fulgebat.
Seite 20 - Heliadse, or children of the sun (that is, men from the East), excelled all other men in knowledge, particularly in the knowledge of the stars. One of this race, named Actis (a ray), built Heliopolis, and named it after his father, the sun. Thenceforward the Egyptians cultivated astrology with so much assiduity as to be considered its inventors. On the other hand Tatius says that the Egyptians taught the Chaldaeans astrology.
Seite 405 - The knowledge which man had acquired of the visible heavens received many important accessions from the discoveries which Galileo was enabled to make by means of the telescope. Except the sun and moon, not one of the celestial bodies had hitherto been observed to have any visible form or magnitude, and it was to the eye of reason alone that those appeared to be anything but plane surfaces : the fixed stars and the...
Seite 406 - ... of form ; while the fixed stars appeared unchanged, or only divested of the radiance with which they seem to be surrounded when seen by the naked eye ; and hence it became obvious that the former must constitute a distinct group of bodies infinitely nearer the earth than the others. The sun, from the spots observed on his surface, was found to revolve on its axis, and consequently was ascertained to be globular; and the light and dark spaces on the moon were distinctly perceived to be mountains...
Seite 64 - ... varias ipsa lucis mutationes habet ; atque etiam tum subiecta atque opposita soli radios eius et lumen obscurat, tum ipsa incidens in umbram terrae, cum est e regione solis, interpositu interiectuque terrae repente deficit.