Fourteen Weeks in Descriptive Astronomy |
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Page 36
... EQUINOCTIAL , and the ECLIPTIC Systems . Each of these has ( 1 ) its Principal Circle , ( 2 ) its Subordinate Circles , ( 3 ) its Points , and ( 4 ) its Meas- urements . • I. THE HORIZON SYSTEM . ( a ) The PRINCIPAL 36 INTRODUCTION .
... EQUINOCTIAL , and the ECLIPTIC Systems . Each of these has ( 1 ) its Principal Circle , ( 2 ) its Subordinate Circles , ( 3 ) its Points , and ( 4 ) its Meas- urements . • I. THE HORIZON SYSTEM . ( a ) The PRINCIPAL 36 INTRODUCTION .
Page 38
... EQUINOCTIAL SYSTEM . ( a ) The PRINCIPAL CIRCLE is the Equinoctial . This is the Celestial Equator , or the earth's equator , ex- tended to the Celestial Sphere . ( b ) SUBORDINATE CIRCLES . - These are the Hour Circles ( Right ...
... EQUINOCTIAL SYSTEM . ( a ) The PRINCIPAL CIRCLE is the Equinoctial . This is the Celestial Equator , or the earth's equator , ex- tended to the Celestial Sphere . ( b ) SUBORDINATE CIRCLES . - These are the Hour Circles ( Right ...
Page 39
... equinoctial eastward . R. A. corresponds to terrestrial longitude , and may ex- tend to 360 ° East , instead of 180 ° as on the earth . R. A. is never measured westward . The starting point is the meridian passing through the vernal ...
... equinoctial eastward . R. A. corresponds to terrestrial longitude , and may ex- tend to 360 ° East , instead of 180 ° as on the earth . R. A. is never measured westward . The starting point is the meridian passing through the vernal ...
Page 40
... Equinoctial System is largely used by modern astronomers , and accompanies the Equatorial Tele- scope , Sidereal Clock , and Chronographs of the best Observatories . X III . THE ECLIPTIC SYSTEM . ( a ) The PRINCIPAL CIRCLE is the ...
... Equinoctial System is largely used by modern astronomers , and accompanies the Equatorial Tele- scope , Sidereal Clock , and Chronographs of the best Observatories . X III . THE ECLIPTIC SYSTEM . ( a ) The PRINCIPAL CIRCLE is the ...
Page 41
... equinoctial . The place where the sun crosses the equinoctial * in going North , which occurs about the 21st of March , is called the Vernal Equinox . The place where the sun crosses the equinoctial in going South , which occurs about ...
... equinoctial . The place where the sun crosses the equinoctial * in going North , which occurs about the 21st of March , is called the Vernal Equinox . The place where the sun crosses the equinoctial in going South , which occurs about ...
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Common terms and phrases
ancients Andromeda angle aphelion appear Aries astronomers atmosphere axis Boötes bright brilliant Canis Minor Capricornus Cassiopeia cause Celestial Sphere centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior conjunction inferior planet Jupiter latitude length light luminous lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon's motion move naked eye nearly nebula Neptune night node north pole Orion parallax pass path penumbra perihelion Perseus Pisces polar Polaris precession rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space spots summer sun's surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible winter Zodiac