## Outlines of Astronomy |

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according actual angle appear astronomers atmosphere axis begin belonging body bright calculations called carried celestial objects centre circle clock comes comet compared consider course cross described determined diameter direction disk distance drawn Earth ecliptic effect equal equator equinox exactly fact farther force given half Hence horizon hour instance kind known latitude learned length less light longitude look Mars mass matter mean measure ment meridian miles Moon Moon's motion move movement nearly northern noticed object observations once opposite orbit parallax particular passing period plane pole present reach reason reflected refraction regard respect ring rise rotation round satellites seems seen shape side sidereal sometimes sphere stars straight Sun's suppose surface telescope terrestrial thing tion turned usually whole 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 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.