Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary HistoryMarsh, Capen, Lyon and Webb, 1841 - 419 |
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Strona 21
... sometimes denominated the equinoctial . The secondaries to the equator , -that is , the great circles passing through the poles of the equator , -are called meridians , because that secondary which passes through the zenith of any place ...
... sometimes denominated the equinoctial . The secondaries to the equator , -that is , the great circles passing through the poles of the equator , -are called meridians , because that secondary which passes through the zenith of any place ...
Strona 51
... sometimes fixed immovably to a solid foundation , as a pillar of stone , which is built up from a depth in the ground below the reach of frost . When enclosed in a building , as in an observatory , the stone pillar is carried up ...
... sometimes fixed immovably to a solid foundation , as a pillar of stone , which is built up from a depth in the ground below the reach of frost . When enclosed in a building , as in an observatory , the stone pillar is carried up ...
Strona 55
... sometimes twenty feet in diameter , in order that very small angles may be measured on its limb ; for it is ob- vious that a small angle , as one second , will be a larger space on the limb of an instrument , in proportion as the ...
... sometimes twenty feet in diameter , in order that very small angles may be measured on its limb ; for it is ob- vious that a small angle , as one second , will be a larger space on the limb of an instrument , in proportion as the ...
Strona 57
... sometimes made their own telescopes ; but they have seldom , if ever , possessed the refined manual skill which is requisite for graduating delicate instruments . The sextant is also one of the most valuable instru- ments for taking ...
... sometimes made their own telescopes ; but they have seldom , if ever , possessed the refined manual skill which is requisite for graduating delicate instruments . The sextant is also one of the most valuable instru- ments for taking ...
Strona 62
... sometimes greater and some- times less than mean time , the two must obviously be sometimes equal to each other . This is , in fact , the case four times a year , namely , April fifteenth , June fifteenth , September first , and ...
... sometimes greater and some- times less than mean time , the two must obviously be sometimes equal to each other . This is , in fact , the case four times a year , namely , April fifteenth , June fifteenth , September first , and ...
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angle appear ascertain astronomers atmosphere attraction axis called celestial centre circle comet conjunction constellation degrees diameter direction discovery disk distance diurnal motion doctrine double stars earth ecliptic equal equator equinox exhibited fact fixed stars force Galileo globe gravity greater greatest half Halley's comet heavenly bodies heavens Hence Herschel horizon hundred inferior conjunction instrument John Herschel Jupiter Kepler latitude laws length less light longitude lunar lunar eclipse magnitude measure Mercury meridian meteors millions of miles minutes moon moon's motion move Nature nearer nearly node objects observations opposite orbit parallax passing perihelion period phenomena planetary planets pole respect revolve right ascension ring round satellites Saturn seen shadow side space spectator sphere sun's superior planets supposed surface telescope thousand tides tion truth Tycho Tycho Brahe universal gravitation Uranus velocity Venus vernal equinox visible west to east