Fourteen Weeks in Descriptive Astronomy |
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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 40
... Equinoctial System is largely used by modern astronomers , and accompanies the Equatorial Tele- scope , Sidereal Clock , and Chronographs of the best Observatories . III . THE ECLIPTIC SYSTEM . ( a ) The PRINCIPAL CIRCLE is the Ecliptic ...
... Equinoctial System is largely used by modern astronomers , and accompanies the Equatorial Tele- scope , Sidereal Clock , and Chronographs of the best Observatories . III . THE ECLIPTIC SYSTEM . ( a ) The PRINCIPAL CIRCLE is the Ecliptic ...
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 angle aphelion appear astronomers atmosphere axis bright brilliant called Capricornus Cassiopeia Celestial Sphere centre circle color comet conjunction constellation Cor Caroli dark density diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light longitude luminous lunar magnitude Mars mean distance measured Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune night node north pole obliquity observer orbit parallax pass path penumbra perihelion Perseus planet polar position rays revolve Right Ascension ring rotation satellites Saturn seasons seen shadow shine side sidereal sidereal day solar system space spots summer sun's superior planet supposed surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major varies velocity Venus vernal equinox visible zenith zodiac