A treatise on astronomy |
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Página 10
... ratio of the radius of curvature in E to the radius of curvature in F ( as is proved by the writers on conics ) , and there- fore in a given ratio one to the other . Then QV and R ZS being drawn parallel to Pp , and QXY W parallel to a ...
... ratio of the radius of curvature in E to the radius of curvature in F ( as is proved by the writers on conics ) , and there- fore in a given ratio one to the other . Then QV and R ZS being drawn parallel to Pp , and QXY W parallel to a ...
Página 11
... ratio named . ... Then , if an angle be taken , the tangent of which shall be to the tangent of either latitude , as the less axis to the greater , the measure of a degree in that lati- tude will be to the measure of a degree at the ...
... ratio named . ... Then , if an angle be taken , the tangent of which shall be to the tangent of either latitude , as the less axis to the greater , the measure of a degree in that lati- tude will be to the measure of a degree at the ...
Página 54
... ratio compounded of the inverse ratio of the distances from the earth's centre , and the direct ratio of the sines of the apparent distances from the zenith . For , when the distance from the zenith is given , the sine of the parallax ...
... ratio compounded of the inverse ratio of the distances from the earth's centre , and the direct ratio of the sines of the apparent distances from the zenith . For , when the distance from the zenith is given , the sine of the parallax ...
Página 67
... ratio of Ba : Ci , the sines of refraction and incidence , is constant also , by the laws of refraction , their differ- ence e i must vary as Ba ; and consequently a i will But A T being = BN vary as Ba BN ' aNx Ba cause a N is constant ...
... ratio of Ba : Ci , the sines of refraction and incidence , is constant also , by the laws of refraction , their differ- ence e i must vary as Ba ; and consequently a i will But A T being = BN vary as Ba BN ' aNx Ba cause a N is constant ...
Página 96
... ratio of 1 to 2 , it is evident that the arcs themselves must also be nearly in the ratio of 1 to 2 , and therefore the re- quired hour must end about one hour before the sun sets the time on which the sun sets , as found by Prob . I ...
... ratio of 1 to 2 , it is evident that the arcs themselves must also be nearly in the ratio of 1 to 2 , and therefore the re- quired hour must end about one hour before the sun sets the time on which the sun sets , as found by Prob . I ...
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Términos y frases comunes
aberration altitude aphelion apparent motion apparent semidiameter appear ascertained astronomers axis azimuth calculation centre circle co-sine co-tang comet conjunction consequently deduced degree described determined diameter difference disc diurnal motion earth ecliptic ellipsis epicycloid equal errour excentricity eye's fixed stars given greater greatest equation Greenwich heavenly bodies heavens heliocentric hence horary motion horizon horizontal parallax hour angle inclination inferiour interval jupiter known latitude longitude lunar eclipses magnitude mean anomaly mean distance mean motion mercury meridian method moon moon's nearly node noon obliquity observations opposition orbit parallax parallel passing perihelion perpendicular planet pole PROB proportion radius ratio refraction respect revolution right ascension right-angled satellites saturn shadow shew shewn sine solar star's subtracted sun's declination superiour supposed tang tangent telescope tion triangle true anomaly true place tude velocity venus vertical whence zenith distance
Pasajes populares
Página 484 - Shot through vast masses of enormous weight ? Who bid brute matter's restive lump assume Such various forms, and gave it wings to fly ? Has matter innate motion ? then each atom, Asserting its indisputable right To dance, would form an universe of dust...
Página 487 - This Being governs all things, not as the soul of the world, but as Lord over all; and on account of his dominion he is wont to be called Lord God...
Página 140 - The qualities of bodies, which admit neither intensification nor remission of degrees and which are found to belong to all bodies within the reach of our experiments, are to be esteemed the universal qualities of all bodies whatsoever.
Página 489 - As a blind man has no idea of colors, so have we no idea of the manner by which the all-wise God perceives and understands all things. He is utterly void of all body and bodily figure, and can therefore neither be seen, nor heard, nor touched ; nor ought he to be worshipped under the representation of any corporeal thing. We have ideas of his attributes, but what the real substance of anything is, we know not.
Página 489 - Whence also He is all similar, all eye, all ear, all brain, all arm, all power to perceive, to understand, and to act ; but in a manner not at all human, in a manner not at all corporeal, in a manner utterly unknown to us.
Página 488 - He is eternal and infinite, omnipotent and omniscient; that is, his duration reaches from eternity to eternity; his presence from infinity to infinity; he governs all things, and knows all things that are or can be done.
Página 36 - Seek him that maketh the seven stars and Orion, And turneth the shadow of death into the morning, And maketh the day dark with night: That calleth for the waters of the sea, And poureth them out upon the face of the earth : The Lord is his name: That strengtheneth the spoiled against the strong, So that the spoiled shall come against the fortress.
Página 36 - Ye who turn judgment to wormwood, and leave off righteousness in the earth, seek him that maketh the seven stars and Orion, and turneth the shadow of death into the morning, and maketh the day dark with night; that calleth for the waters of the sea, and poureth them out upon the face of the earth; the Lord is his name; that strengtheneth the spoiled against the strong, so that the spoiled shall come against the fortress.
Página 126 - Systems in many respects resemble machines. A machine is a little system, created to perform, as well as to connect together, in reality, those different movements and effects which the artist has occasion for. A system is an imaginary machine invented to connect together in the fancy those different movements and effects which are already in reality performed.
Página 127 - The machines that are first invented to perform any particular movement are always the most complex, and succeeding artists generally discover that, with fewer wheels, with fewer principles of motion, than had originally been employed, the same effects may be more easily produced.