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Page 3
... actual progress , inasmuch as he will find it at once easier and more satisfactory to pursue from the outset a straight and definite path , than to be con- stantly stepping aside , involving himself in perplexities and circuits , which ...
... actual progress , inasmuch as he will find it at once easier and more satisfactory to pursue from the outset a straight and definite path , than to be con- stantly stepping aside , involving himself in perplexities and circuits , which ...
Page 20
... actual size of the earth itself ; and , in fact , were it not for the effect of refraction , by which we are enabled to see in some small degree round the interposed seg- ment ( as will be hereafter explained ) , this would be a ...
... actual size of the earth itself ; and , in fact , were it not for the effect of refraction , by which we are enabled to see in some small degree round the interposed seg- ment ( as will be hereafter explained ) , this would be a ...
Page 30
... direct trans- mission , but by reflection upon the vapours , and minute solid particles , which float in it , and , perhaps , also on the actual material atoms of the air itself . To 30 CHAP . I. A TREATISE ON ASTRONOMY .
... direct trans- mission , but by reflection upon the vapours , and minute solid particles , which float in it , and , perhaps , also on the actual material atoms of the air itself . To 30 CHAP . I. A TREATISE ON ASTRONOMY .
Page 31
sir John Frederick W. Herschel (1st bart.) the actual material atoms of the air itself . To understand how this takes place , we must recollect , that it is not only by the direct light of a luminous object that we see , but that ...
sir John Frederick W. Herschel (1st bart.) the actual material atoms of the air itself . To understand how this takes place , we must recollect , that it is not only by the direct light of a luminous object that we see , but that ...
Page 34
... Actual measurement with a proper instru- ment corrects our error , without , however , dispelling our illusion . By this we learn , that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a ...
... Actual measurement with a proper instru- ment corrects our error , without , however , dispelling our illusion . By this we learn , that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a ...
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Common terms and phrases
altitude amount angle angular appear arise ascertained astronomical ation atmosphere axis body calculation called cause celestial centre centrifugal force circle clock comet course degree described determined diameter difference direction distance disturbing diurnal motion double stars earth earth's surface ecliptic effect ellipse equal equator equatorial equinoctial equinox error exact exactly excentricity fixed force globe gravity heavens heliocentric hemisphere horizon hour angle inclination instance instrument interval Jupiter latitude latter length longitude lunar magnitude mass mean measured meridian moon moon's mural circle nature nearly nodes nutation object observed orbit parallax parallel perihelion period planet polar pole portion position precession proportion rays reckoning refraction render respect revolution revolve right ascension rotation round satellites Saturn seen sidereal sidereal period situation solar spectator sphere spherical stars station sun's suppose synodical period telescope tion triangle Uranus variation velocity vertical visible weight whole zenith
Popular passages
Page 194 - Capricorn; because the sun, at the respective solstices, is situated in the division, or signs of the ecliptic so denominated. Of these signs there are twelve, each occupying 30° of its circumference. They commence at the vernal equinox, and are named in order — Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricornus, Aquarius, Pisces.
Page 6 - SACRED HISTORY OF THE WORLD, Attempted to be Philosophically considered, in a Series of Letters to a Son. By SHARON TURNER, FSA and RASL New Edition, edited by the Rev.
Page 224 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 275 - Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile...
Page 374 - This earth ? reciprocal, if land be there, Fields and inhabitants. Her spots thou seest As clouds, and clouds may rain, and rain produce Fruits in her soften'd soil, for some to eat Allotted there ; and other suns, perhaps, With their attendant moons, thou wilt descry, Communicating male and female light, Which two great sexes animate the world, Stored in each orb, perhaps, with some that live...
Page 375 - Thus a yellow colour predominating in the light of the brighter star, that of the less bright one in the same field of view will appear blue ; while, if the tint of the brighter star verge to crimson, that of the other will exhibit a tendency to green — or even appear as a vivid green, under favourable circumstances.
Page 201 - The sun's rays are the ultimate source of almost every motion which takes place on the surface of the earth. By its heat are produced all winds, and those disturbances in the electric equilibrium of the atmosphere which give rise to the phenomena of lightning, and probably also to those of terrestrial magnetism and the aurora.
Page 221 - That it is our own immediate consciousness of effort when we exert force to put matter in motion, or to oppose and neutralize force, which gives us this internal conviction of power and causation so far as it refers to the material world, and compels us to believe that whenever we see material objects put in motion from a state of rest, or deflected from their rectilinear paths and changed in their velocities if already in motion, it is in consequence of such an effort somehow exerted, though not...
Page 6 - INTRODUCTION TO GEOLOGY. Intended to convey Practical Knowledge of the Science, and comprising the most important recent discoveries ; with explanations of the facts and phenomena which serve to confirm or invalidate various Geological Theories. By ROBERT BAKEWELL.