Outlines of AstronomyGinn brothers, 1874 - 415 pàgines |
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Frases i termes més freqüents
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
Passatges populars
Pàgina 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.
Pàgina 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...
Pàgina 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.
Pàgina 224 - Surfaces of spheres are to each other as the squares of their diameters.
Pàgina 298 - ... directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
Pàgina 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
Pàgina ii - BROTHERS, In the Office of the Librarian of Congress at Washington. CAMBRIDGE: PRESS OF JOHN WILSON AND SON.
Pàgina 375 - Astronomical Observations and Researches made at Dunsink, the Observatory of Trinity College, Dublin,
Pàgina 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.
Pàgina 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.