Lessons on the globes1842 |
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Page 17
... Parallax is that apparent angular motion of an object which is occasioned by changing the point from which we view it . See Chronology of Ancient Observations , ( Index ) . M Ꮢ B k Illustration . Whilst the boy A c 2.
... Parallax is that apparent angular motion of an object which is occasioned by changing the point from which we view it . See Chronology of Ancient Observations , ( Index ) . M Ꮢ B k Illustration . Whilst the boy A c 2.
Page 18
... Parallax , used astronomically , is the difference of apparent position of a heavenly body , viewed from the sur- face of the earth and from the earth's centre . G An observer , who has the object in his zenith , sees it as if he were ...
... Parallax , used astronomically , is the difference of apparent position of a heavenly body , viewed from the sur- face of the earth and from the earth's centre . G An observer , who has the object in his zenith , sees it as if he were ...
Page 19
... parallax of the moon , is found to be about of radius M G. Hence ( H G ) the semi - diame- ter of our earth , or 4000 miles , ( which is in this case the sine , ) is of the distance of the moon , ( in this case our radius , ) and 4000 ...
... parallax of the moon , is found to be about of radius M G. Hence ( H G ) the semi - diame- ter of our earth , or 4000 miles , ( which is in this case the sine , ) is of the distance of the moon , ( in this case our radius , ) and 4000 ...
Page 20
... parallax " This once determined , the Horizontal Parallax , " ( and from it the distance of the sun , ) " is easily found by dividing the angle of paral- lax so found by the sum of the sines of the two latitudes . " John Herschel's Ast ...
... parallax " This once determined , the Horizontal Parallax , " ( and from it the distance of the sun , ) " is easily found by dividing the angle of paral- lax so found by the sum of the sines of the two latitudes . " John Herschel's Ast ...
Page 49
... parallax of the moon , as she varies her distance from us whilst performing her monthly ellipse : thus , we may learn she was in Perigec , or nearest to us , about the 1st and the 28th , her parallax being then greatest . ( See M on p ...
... parallax of the moon , as she varies her distance from us whilst performing her monthly ellipse : thus , we may learn she was in Perigec , or nearest to us , about the 1st and the 28th , her parallax being then greatest . ( See M on p ...
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Common terms and phrases
altitude appear Arcturus astronomers atmosphere attraction axis azimuth beams Boötes brass meridian brazen meridian Bridgewater Treatise bring the given Canis Major Cape CELESTIAL GLOBE centre centrifugal force circle coincide consequently constellations corresponding culminating declination diameter difference direction disk distance diurnal diurnal arc earth earth's surface east eastward ecliptic electricity elevated equal equator equinoctial exactly feet fluid Fomalhaut force Frigid Zone given place heat heavenly body hemisphere Hence Herschel horizon inclined inhabitants instant John Herschel Jupiter Jupiter's latitude length light London longitude magnet mass midnight miles minutes moon moon's motion nearly node noon north pole oblique observations orbit parallax particles pass period plane portion position PROBLEM pupil quadrant rays right ascension rising rotation satellites Saturn seen shadow sidereal day solar south pole sphere star sun's place supposed telescope TERRESTRIAL GLOBE tion twilight Uranus vapour velocity Venus vertical whilst zenith
Popular passages
Page 244 - For thus saith the Lord that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: I am the Lord; and there is none else.
Page 6 - The one has suggested to me that, beyond and above all that is visible to man, there may lie fields of creation which sweep immeasurably along, and carry the impress of the Almighty's hand to the remotest scenes of the universe : the other suggests to me...
Page xi - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Page 403 - This disregard is neither supercilious nor causeless. The constellations seem to have been almost purposely named and delineated to cause as much confusion and inconvenience as possible. Innumerable snakes twine through long and contorted areas of the heavens, where no memory call follow them ; bears, lions, and fishes, large and small, northern and southern, confuse all nomenclature, &c.
Page 397 - Venus a pea, on a circle of 284 feet in diameter ; the Earth also a pea, on a circle of 430 feet ; Mars a rather large pin's head, on a circle of 654 feet ; the Asteroids, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across...
Page 227 - As he sat alone in a garden, he fell into a speculation on the power of gravity ; that as this power is not found sensibly diminished at the remotest distance from the centre of the earth, to which we can rise, neither at the tops of the loftiest buildings, nor even on the summits of the highest mountains ; it appeared to him reasonable to conclude, that this power must extend much...
Page 161 - God," as was said by the ancients, "works by geometry:" the legislation of the material universe is necessarily delivered in the language of mathematics ; the stars in their courses are regulated by the properties of conic sections, and the winds depend on arithmetical and geometrical progressions of elasticity and pressure.
Page 284 - ... the earth. The fall of meteoric stones is much more frequent than is generally believed. Hardly a year passes without some instances occurring ; and if it be considered that only a small part of the earth is inhabited, it may be presumed that numbers fall...
Page 6 - I tread upon, the other redeems it from all its insignificance, for it tells me that in the leaves of every forest, and in the flowers of every garden, and in the waters of every rivulet, there are worlds teeming with life, and numberless as the glories of the firmament.
Page 214 - 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.