A treatise on astronomy |
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Página xiii
Olinthus Gilbert Gregory. ployment which requires the Authour's persevering attention for more than eight hours in the day , and leaves him scarcely leisure sufficient to remove , by exercise , the injury done to health by such close ...
Olinthus Gilbert Gregory. ployment which requires the Authour's persevering attention for more than eight hours in the day , and leaves him scarcely leisure sufficient to remove , by exercise , the injury done to health by such close ...
Página 17
... hours : and though , as will be shewn hereafter ( Art . 205. & c . ) , these apparent mo- tions are almost entirely to be accounted for by the real motions of the earth ; yet it will enable us to proceed with more ease and regularity ...
... hours : and though , as will be shewn hereafter ( Art . 205. & c . ) , these apparent mo- tions are almost entirely to be accounted for by the real motions of the earth ; yet it will enable us to proceed with more ease and regularity ...
Página 23
... hour circles ; because the sun in his apparent diurnal motion , passing over 360 ° of a circle parallel to the equator , goes through th of it , or 15 ° , in the space of an hour . 44. The right ascension of a body , is the arc of the ...
... hour circles ; because the sun in his apparent diurnal motion , passing over 360 ° of a circle parallel to the equator , goes through th of it , or 15 ° , in the space of an hour . 44. The right ascension of a body , is the arc of the ...
Página 27
... hours to pass through it , and consequently the day is more than twelve hours long . The days will continue lengthening , and the sun rising and setting nearer the north point , as he approaches towards the point E , where the north de ...
... hours to pass through it , and consequently the day is more than twelve hours long . The days will continue lengthening , and the sun rising and setting nearer the north point , as he approaches towards the point E , where the north de ...
Página 28
... hours , and consequently the day is less than twelve hours in length . The days will continue to decrease until the sun has reached C , the greatest declination south , when his diurnal motion will be described in the tropic of ...
... hours , and consequently the day is less than twelve hours in length . The days will continue to decrease until the sun has reached C , the greatest declination south , when his diurnal motion will be described in the tropic of ...
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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.