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 20
... half of the earth were removed , and we stood on the rational horizon . The poles of the horizon are the zenith and nadir . The zenith is the point directly over our heads ; and the nadir , that directly under our feet . The plumb- line ...
... half of the earth were removed , and we stood on the rational horizon . The poles of the horizon are the zenith and nadir . The zenith is the point directly over our heads ; and the nadir , that directly under our feet . The plumb- line ...
Strona 22
... half de- grees out of a perpendicular direction , making an angle with the plane itself of sixty - six and a half degrees . The equator , therefore , must be turned the same dis- tance out of a coincidence with the ecliptic , the two ...
... half de- grees out of a perpendicular direction , making an angle with the plane itself of sixty - six and a half degrees . The equator , therefore , must be turned the same dis- tance out of a coincidence with the ecliptic , the two ...
Strona 24
... half de- grees from the poles of the earth . The elevation of the pole of the heavens above the horizon of any place is always equal to the latitude of the place . Thus , in forty degrees of north latitude we see the north star forty ...
... half de- grees from the poles of the earth . The elevation of the pole of the heavens above the horizon of any place is always equal to the latitude of the place . Thus , in forty degrees of north latitude we see the north star forty ...
Strona 25
... , at a price not exceeding ten dollars ; or half that sum for a celestial globe , which will serve alone for studying astronomy . 3 L. A. to aid you in the study of the foregoing definitions DOCTRINE OF THE SPHERE . 25.
... , at a price not exceeding ten dollars ; or half that sum for a celestial globe , which will serve alone for studying astronomy . 3 L. A. to aid you in the study of the foregoing definitions DOCTRINE OF THE SPHERE . 25.
Strona 26
... half way between the poles , will be the equator ; and sev- eral other circles cut between the equator and the poles , parallel to the equator , will represent parallels of lati- tude ; of which , two , drawn twenty - three and a half ...
... half way between the poles , will be the equator ; and sev- eral other circles cut between the equator and the poles , parallel to the equator , will represent parallels of lati- tude ; of which , two , drawn twenty - three and a half ...
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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