Library of Useful Knowledge: Natural philosophy, 第 3 巻Baldwin and Cradock, 1834 |
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... observed , we may prosecute our observations upon it night after night , and year after year . For the immediate observations of an indivi- dual no more than this is requisite ; but when he wants to register their re- sults , or to ...
... observed , we may prosecute our observations upon it night after night , and year after year . For the immediate observations of an indivi- dual no more than this is requisite ; but when he wants to register their re- sults , or to ...
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... observations and conclusions . Besides this mode of distinction , some of the brighter and more remarkable stars ... observation , however , proves that this appearance of rest is fallacious . The stars all continue at the same ap ...
... observations and conclusions . Besides this mode of distinction , some of the brighter and more remarkable stars ... observation , however , proves that this appearance of rest is fallacious . The stars all continue at the same ap ...
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... observation then confirm , or disprove this conclu- sion ? The sun and moon are visible by day , but their motions ... observed hea- vens , and one in the other part of the sphere , supposed to be completed , and each bisected by a ...
... observation then confirm , or disprove this conclu- sion ? The sun and moon are visible by day , but their motions ... observed hea- vens , and one in the other part of the sphere , supposed to be completed , and each bisected by a ...
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... observe his height when he crosses the meridian , we find that it is less on the 21st day of December , than at any ... observed the nightly appearances of the heavens with any attention , is aware that they continually differ . On each ...
... observe his height when he crosses the meridian , we find that it is less on the 21st day of December , than at any ... observed the nightly appearances of the heavens with any attention , is aware that they continually differ . On each ...
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... observed that its oscillations appeared to be all of the same length , seems to have proceeded on the principle ... observations of distance cannot be made with any great degree of accuracy , unless by means , hereafter pointed out ...
... observed that its oscillations appeared to be all of the same length , seems to have proceeded on the principle ... observations of distance cannot be made with any great degree of accuracy , unless by means , hereafter pointed out ...
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多く使われている語句
aberration altitude apogee apparent diameter ascer ascertained astronomers axis calculated called centre circle comet consequently corresponding course declination deduced degree determined direction ecliptic effect equal equator equinox excentricity fixed stars given greater greatest heavenly body heavens Hipparchus horizon hour angle inferior planet instance Jupiter Kepler known latitude latter length less longitude lunar mean anomaly measured meridian method moon moon's nearly node nutation obliquity observed orbit parallax parallel passing perigee perpendicular planet pole position precession proportion Ptolemy quantity radius refraction remarkable respect retrograde retrograde motion revolution revolve right angle right ascension rotation round the earth round the sun satellites seen side sidereal sine solar solstice South sphere spherical sun's superior planet supposed supposition Surya Siddhanta synodic period tables tance tangent tion triangle true tude variation varies velocity whole zenith distance
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18 ページ - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
155 ページ - D'Alembert, was the Precession of the equinoxes and the Nutation of the earth's axis, according to the theory of gravitation.
46 ページ - Having given the radius of an arc of any colour in the secondary rainbow, find the ratio of the sine of incidence to the sine of refraction when rays of that colour pass out of air into water.
9 ページ - The lowest and most level parts of the earth, when penetrated to a very great depth, exhibit nothing but horizontal strata composed of various substances, and containing almost all of them innumerable marine productions. Similar strata, with the same kind of productions, compose the hills even to a great height. Sometimes the shells are so numerous as to constitute the entire body of the stratum. They are almost...
28 ページ - Scotland was divided into two provinces — the one on the north, and the other on...
187 ページ - ... the squares of the periodic times are as the cubes of the distances from the common centre, the centripetal forces will be inversely as the squares of the distances.
14 ページ - ... invisible. These animals are of a great variety of shapes and sizes, and in such prodigious numbers, that, in a short time, the whole surface of the rock appears to be alive and in motion. The most common...
2 ページ - In experimental philosophy we are to look upon propositions collected by general induction from phenomena as accurately or very nearly true, notwithstanding any contrary hypotheses that may be imagined, till such time as other phenomena occur, by which they may either be made more accurate, or liable to exceptions.
15 ページ - ... mark ; but the coral sand and other broken remnants thrown up by the sea, adhere to the rock, and form a solid mass with it, as high as the common tides reach. That elevation, surpassed the future remnants, being rarely covered, lose their adhesive...
14 ページ - The most common worm is in the form of a star, with arms from four to six inches long, which are moved about with a rapid motion, in all directions, probably to catch food. Others are so sluggish, that they may be mistaken for pieces of the rock, and are generally of a dark colour, and from four to five inches long, and two or three round.