The Geography of the Heavens, and Class Book of Astronomy; Accompanied by a Celestial Atlas |
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Page 26
... Equinoctial , is the great circle formed on the concave surface of the heavens , by pro- ducing the plane of the Earth's equator . A plane is that which has surface but not thickness . The plane of a circle is that imaginary superficies ...
... Equinoctial , is the great circle formed on the concave surface of the heavens , by pro- ducing the plane of the Earth's equator . A plane is that which has surface but not thickness . The plane of a circle is that imaginary superficies ...
Page 27
... Equinoctial , the other half on the south side , making an angle with it of 234 ° . This angle is called the obliquity of the Ecliptic . The axis of the Eclip- tic makes the same angle with the axis of the heavens ; so that the poles of ...
... Equinoctial , the other half on the south side , making an angle with it of 234 ° . This angle is called the obliquity of the Ecliptic . The axis of the Eclip- tic makes the same angle with the axis of the heavens ; so that the poles of ...
Page 28
... equinoctial , and parallel to it ; or they may be consid ered as circles formed by producing the parallels of latitude to the heavens . The Tropic of Cancer is a small circle , which lies 2310 north of the equinoctial , and parallel to ...
... equinoctial , and parallel to it ; or they may be consid ered as circles formed by producing the parallels of latitude to the heavens . The Tropic of Cancer is a small circle , which lies 2310 north of the equinoctial , and parallel to ...
Page 29
... equinoctial , measured on a meridian . Right Ascension is the distance of a heavenly body east from the first point of Aries , measured on the equinoctial . It is more convenient to describe the situation of the heavenly bodies by their ...
... equinoctial , measured on a meridian . Right Ascension is the distance of a heavenly body east from the first point of Aries , measured on the equinoctial . It is more convenient to describe the situation of the heavenly bodies by their ...
Page 31
... equinoctial and parallel to it , are called Parallels of Declination . Those which are drawn up and down through the maps , at intervals of 15 ° , are called Meridians of Right Ascension , or Hour Circles . The scale at the top and ...
... equinoctial and parallel to it , are called Parallels of Declination . Those which are drawn up and down through the maps , at intervals of 15 ° , are called Meridians of Right Ascension , or Hour Circles . The scale at the top and ...
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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 Delta Denebola Describe 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 mean distance Mercury meridian millions of miles minutes Moon Moon's motion naked eye nearly nebulæ night node north pole northern hemisphere observed orbit Orion parallax passing perihelion period Perseus phenomena planets Pleiades polar star position principal star represented revolution revolve right ascension rise satellites Saturn seasons seen side sidereal Sirius situated small stars solar system solstice southern spots Sun's supposed surface Taurus telescope tion triangle Ursa Venus vernal equinox Virgo visible whole number Zeta Zodiac