Outlines of Astronomy |
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Page 2
... seems to us to stand still ; but , in fact , it is always moving along in much the same way that a ball is moving after it has rolled off the roof of a house and before it has come to the ground . Such a ball has at least three ...
... seems to us to stand still ; but , in fact , it is always moving along in much the same way that a ball is moving after it has rolled off the roof of a house and before it has come to the ground . Such a ball has at least three ...
Page 12
... seem comparatively slight changes in the condition of things about them . Exposure to a climate to which they are ... seems to aim at deciding whether any thing is known about the parts of the universe beyond the Earth which will ...
... seem comparatively slight changes in the condition of things about them . Exposure to a climate to which they are ... seems to aim at deciding whether any thing is known about the parts of the universe beyond the Earth which will ...
Page 13
... seem much like each other before they have been studied carefully , and the Moon seems more like the Sun than like the Earth . But men know now that these appearances differ very much from the reality . There are many celestial objects ...
... seem much like each other before they have been studied carefully , and the Moon seems more like the Sun than like the Earth . But men know now that these appearances differ very much from the reality . There are many celestial objects ...
Page 14
... seem among the brightest are compara- tively small , and resemble the Earth more than they resemble the Sun. These ... seems likely that if we could travel about the universe and examine the regions through which we passed as closely ...
... seem among the brightest are compara- tively small , and resemble the Earth more than they resemble the Sun. These ... seems likely that if we could travel about the universe and examine the regions through which we passed as closely ...
Page 20
... seems to be that it is a great globe of gas , although the gases of its interior must be compressed and condensed to an extent which must make them very unlike any terrestrial gas with which we are acquainted . The exterior parts of the ...
... seems to be that it is a great globe of gas , although the gases of its interior must be compressed and condensed to an extent which must make them very unlike any terrestrial gas with which we are acquainted . The exterior parts of the ...
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Common terms and phrases
aphelion appear astronomers atmosphere axis ball body bright calculations called celestial objects celestial sphere circle clock clouds comet compared consider course cross determined direction disk distance Earth Earth's atmosphere Earth's centre Earth's orbit Earth's rotation ecliptic equal equator equatorial stars exactly eye-piece fact farther Hence Hipparchus horizon Jupiter kind known latitude law of gravitation laws of motion length lens less light limb longitude look Mars mass mean measure ment meridian meteors miles Moon Moon's movement nearer nearly nodes north pole northern noticed nutation object-glass observations opposite orbit parallax particular passing pencil perihelion perpendicular photosphere plane prism refraction regard retrograde revolution right ascension ring round the Sun satellites Saturn seen shape side sidereal sidereal day solstice sometimes spectrum spots stars straight line Sun's suppose surface telescope terrestrial place tion transit triangle Uranus usually Venus vernal equinox vertical visual angle zenith
Popular passages
Page 82 - The squares of the periodic times of any two planets are to each other, in the same proportion as the cubes of their mean distances from the sun.
Page 201 - the eclipse presented, during the total obscuration, a vision magnificent beyond description. As a centre stood the full and intensely black disc of the moon, surrounded by an aureola of soft bright light, through which shot out, as if from the circumference of the moon, straight massive silvery rays, seeming distinct and separate from each other, to a distance of two or three diameters of the lunar disc ; the whole spectacle showing as upon a background of diffused rose-coloured light...
Page 320 - It will be seen that we multiply the denominator of the dividend by the numerator of the divisor for the denominator of the quotient, and the numerator of the dividend by the denominator of the divisor for the numerator of the quotient.
Page 224 - Surfaces of spheres are to each other as the squares of their diameters.
Page 298 - ... directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
Page 390 - The limits of the obliquity of the apparent ecliptic to the equator ^are 24° 35' 58" and 21° 58' 36"; whence it follows that the greatest and least declinations of the sun at the solstices can never differ from each other to any greater extent than 2° 37
Page ii - BROTHERS, In the Office of the Librarian of Congress at Washington. CAMBRIDGE: PRESS OF JOHN WILSON AND SON.
Page 375 - Astronomical Observations and Researches made at Dunsink, the Observatory of Trinity College, Dublin,
Page 193 - The greatest number of eclipses that can happen in a year is seven; five of the sun and two of the moon, or four of the sun and three of the moon.
Page 296 - Every body continues in its state of rest or of uniform rectilinear motion unless compelled to change its state by forces impressed upon it.