The Geography of the Heavens, and Class Book of Astronomy: Accompanied by a Celestial Atlas |
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Page 26
... Horizon , is the circle which terminates our view , where the Earth and sky appear to meet . To a person standing on a plain , this circle is but a few miles in diameter . It the eye be elevated five feet , the radius of the sensible ...
... Horizon , is the circle which terminates our view , where the Earth and sky appear to meet . To a person standing on a plain , this circle is but a few miles in diameter . It the eye be elevated five feet , the radius of the sensible ...
Page 27
... horizon at right angles . The Prime Vertical is that which passes through the east and west points of the horizon . The Ecliptic is the great circle which the Sun appears to describe annually among the stars . It crosses the Equinoc ...
... horizon at right angles . The Prime Vertical is that which passes through the east and west points of the horizon . The Ecliptic is the great circle which the Sun appears to describe annually among the stars . It crosses the Equinoc ...
Page 29
... horizon ; and , for the same reason , those stars which we see directly over head this evening , will at the same hour , three months hence , be seen setting in the west ; having in this time , performed one fourth of their apparent ...
... horizon ; and , for the same reason , those stars which we see directly over head this evening , will at the same hour , three months hence , be seen setting in the west ; having in this time , performed one fourth of their apparent ...
Page 30
... horizon , and are seen no more , until , having passed through the lower hemisphere , they again reappear in the east . It is easy to convert right ascension into time , or time into right ascension ; for if a heavenly body is one hour ...
... horizon , and are seen no more , until , having passed through the lower hemisphere , they again reappear in the east . It is easy to convert right ascension into time , or time into right ascension ; for if a heavenly body is one hour ...
Page 32
... horizon . On this account they are said to be within the circle of perpetual apparition . On the other hand , the identity of the North Polar Star , strange as it may appear , is not so easily determined , by those who are just entering ...
... horizon . On this account they are said to be within the circle of perpetual apparition . On the other hand , the identity of the North Polar Star , strange as it may appear , is not so easily determined , by those who are just entering ...
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Common terms and phrases
3d magnitude 4th magnitude ancient angle appear Arcturus Argo Navis Aries astronomers Auriga axis Beta brightest called Cassiopeia celestial centre Cepheus circle cluster colure comet constellation Cor Caroli declination degree Denebola diameter direction distinguished diurnal motion Earth east ecliptic equal equator equinoctial figure fixed stars Gamma globe head heavenly bodies heavens Hercules Herschel horizon Jupiter latitude length Libra light longitude luminous Mars mean distance Mercury meridian millions of miles minutes Moon Moon's motion naked eye nearly nebulæ night node north pole northern hemisphere o'clock observed orbit Orion parallax passing perihelion period Perseus phenomena planets Pleiades polar star principal star represented revolution revolve right ascension rise satellites Saturn seasons seen side sidereal Sirius situated small stars solar system solstice southern spots square Sun's supposed surface Taurus telescope tion triangle Ursa Venus vernal equinox Virgo visible whole number Zeta Zodiac