The Geography of the Heavens, and Class Book of Astronomy: Accompanied by a Celestial Atlas |
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Page ix
... poles of the world . In such observations , a knowledge of the con- stellations , of the polestar , and of the general positions of all the stars of the first and second magnitude , is of particular importance ; and , therefore , a ...
... poles of the world . In such observations , a knowledge of the con- stellations , of the polestar , and of the general positions of all the stars of the first and second magnitude , is of particular importance ; and , therefore , a ...
Page 26
... Poles of the Heavens are the extremities of their axis . The Equator of the Earth is an imaginary great circle passing round the Earth , east and west , everywhere equally distant from the poles , and dividing it into northern and ...
... Poles of the Heavens are the extremities of their axis . The Equator of the Earth is an imaginary great circle passing round the Earth , east and west , everywhere equally distant from the poles , and dividing it into northern and ...
Page 27
... poles of each are 234 ° apart . This angle is perpetually decreasing . At the commencement of the Christian era , it was about 23 ° 45 ' . At the beginning of 1836 , it was only 23 ° 27 ′ 38 " , show . ing an annual diminution of about ...
... poles of each are 234 ° apart . This angle is perpetually decreasing . At the commencement of the Christian era , it was about 23 ° 45 ' . At the beginning of 1836 , it was only 23 ° 27 ′ 38 " , show . ing an annual diminution of about ...
Page 28
... poles that the tropics are from the equator . The northern is called the Arctic circle , and the southern the Antarctic circle . Meridians are imaginary great circles drawn through the poles of the world , cutting the equator and the ...
... poles that the tropics are from the equator . The northern is called the Arctic circle , and the southern the Antarctic circle . Meridians are imaginary great circles drawn through the poles of the world , cutting the equator and the ...
Page 31
... Pole are always , and those around the South Pole , never , visible to us . These constellations are represented on the sixth and seventh maps , called circumpolar maps , which are an exact continu- ation of the others , and if joined ...
... Pole are always , and those around the South Pole , never , visible to us . These constellations are represented on the sixth and seventh maps , called circumpolar maps , which are an exact continu- ation of the others , and if joined ...
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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