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 vi
... convenient to enter so far into the explanation of those systems as to shew , from the account delivered by Ptolemy , how the dimensions of the Deferents and Epicycles , and the values of the equations arising vi PREFACE .
... convenient to enter so far into the explanation of those systems as to shew , from the account delivered by Ptolemy , how the dimensions of the Deferents and Epicycles , and the values of the equations arising vi PREFACE .
Seite vii
With Plates Illustrating, Chiefly, the Ancient Systems John Narrien. ents and Epicycles , and the values of the equations arising from them , were determined . But the entire neglect into which the systems have fallen seems to render ...
With Plates Illustrating, Chiefly, the Ancient Systems John Narrien. ents and Epicycles , and the values of the equations arising from them , were determined . But the entire neglect into which the systems have fallen seems to render ...
Seite viii
... epicycle , about its mean place , produced the apparent changes of direction , and the principal variations of its velocity . Between the time of Ptolemy and the establishment of the Mohammedan power in Asia , astronomy appears to have ...
... epicycle , about its mean place , produced the apparent changes of direction , and the principal variations of its velocity . Between the time of Ptolemy and the establishment of the Mohammedan power in Asia , astronomy appears to have ...
Seite 93
... epicycles , which afterwards became so general . It was impossible for the ancients to have any proof of the different distances of the planets from the earth , except such as " Nat . Hist . Lib . II . cap . 13 . might be obtained from ...
... epicycles , which afterwards became so general . It was impossible for the ancients to have any proof of the different distances of the planets from the earth , except such as " Nat . Hist . Lib . II . cap . 13 . might be obtained from ...
Seite 185
... epicycles , on the circumferences of which the planets were supposed to move while the centres of those moved on the circumferences of the principal orbits . The epicycles afterwards became leading features in the different systems of ...
... epicycles , on the circumferences of which the planets were supposed to move while the centres of those moved on the circumferences of the principal orbits . The epicycles afterwards became leading features in the different systems of ...
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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 evident 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
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Seite 387 - AE fore the strain at D will be — ~ — x BD. Had the beam been lying horizontally, the strain at D, from the weight W suspended at C, would have been — -—- — X BD. It is therefore diminished in the proportion of AC to AE, that is, in the proportion of radius to the cosine of the elevation, or in the proportion of the secant of elevation to the radius. It is evident, that this law of diminution of the strain is the same whether the strain arises from a load on any part of the rafter, or from...
Seite 32 - 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 510 - ¡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 286 - A lightning rod protects a conic space whose height is the length of the rod, whose base is a circle having its radius equal to the height of the rod, and whose side is the quadrant of a circle whose radius is equal to the height of the rod.
Seite 100 - 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 262 - Previous to his time, the doctrine was held, that the earth is at rest in the centre of the universe, and that the sun, moon, and stars...
Seite 98 - ... 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 221 - This value is greater than the truth by 6™ 13" only; since, according to La Place, the length of the tropical year at that time must have been equal to 365-242215 days, or about 4-2° shorter than in the present age. By such a result much was gained, but Hipparchus, conscious of the uncertainty attending the observations of the solstices, from the smallness of the variations in the lengths of the shadows cast by the gnomon, employed the method of the equinoxes, by observations made with the equatorial...
Seite 33 - ... cum sol igneus sit Océanique alatur umoribus, quia nullus ignis sine pastu aliquo possit permanere, necesse est aut ei similis sit igni, quem adhibemus ad usum atque victum, 41 aut ei, qui corporibus animantium continetur...
Seite 415 - ... repugnat enim, ut putemus id quod cogitat, eo ipso tempore quo cogitat, non existere. Ac proinde haec cognitio, ego cogito, ergo sum, est omnium prima et certissima, quae cuilibet ordine philosophanti occurrat.