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Page 18
... spectator placed at M will therefore see not only all the vault of the sky above this line , as X Z Y , but also that portion or zone of it which lies between X N and YQ ; in other words , his sky will be more than a hemisphere by the ...
... spectator placed at M will therefore see not only all the vault of the sky above this line , as X Z Y , but also that portion or zone of it which lies between X N and YQ ; in other words , his sky will be more than a hemisphere by the ...
Page 19
... spectator , S , situated at some certain height above the sea , sees the whole of the ship , even to the water line where it rests on the sea , as at A. As it recedes it diminishes , it is true , in apparent size , but still the whole ...
... spectator , S , situated at some certain height above the sea , sees the whole of the ship , even to the water line where it rests on the sea , as at A. As it recedes it diminishes , it is true , in apparent size , but still the whole ...
Page 26
... spectator , had the atmosphere no existence : it thus produces a false im- pression respecting their places , which must be rectified by ascertaining the amount and direction of the displace- ment so apparently produced on each , before ...
... spectator , had the atmosphere no existence : it thus produces a false im- pression respecting their places , which must be rectified by ascertaining the amount and direction of the displace- ment so apparently produced on each , before ...
Page 27
... spectator would see it in the direction of the straight line AS . But , in reality , when the ray of light SA ... spectator's eye . The ray by which he will see the star is , therefore , not S dA , but another ray which , had there been ...
... spectator would see it in the direction of the straight line AS . But , in reality , when the ray of light SA ... spectator's eye . The ray by which he will see the star is , therefore , not S dA , but another ray which , had there been ...
Page 28
... spectator ; but which , being bent by the air into the curve SDCBA , actually strikes on A. Now , it is a law of optics , that an object is seen in the direction which the visual ray has at the instant of arriving at the eye , without ...
... spectator ; but which , being bent by the air into the curve SDCBA , actually strikes on A. Now , it is a law of optics , that an object is seen in the direction which the visual ray has at the instant of arriving at the eye , without ...
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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.