Fourteen Weeks in Descriptive Astronomy |
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Page 116
... vernal equinox . He is overhead at the equator , and the days and nights are again equal . It is our spring , but in the south temperate zone it is autumn . XII . The yearly path finished . - The earth moves on in its orbit through the ...
... vernal equinox . He is overhead at the equator , and the days and nights are again equal . It is our spring , but in the south temperate zone it is autumn . XII . The yearly path finished . - The earth moves on in its orbit through the ...
Page 118
... vernal equinox to aphelion , the attraction of the sun tends to check its speed ; from that point to the autumnal equinox , the at- traction is partly in the direction of its motion , and so increases its velocity . The same principle ...
... vernal equinox to aphelion , the attraction of the sun tends to check its speed ; from that point to the autumnal equinox , the at- traction is partly in the direction of its motion , and so increases its velocity . The same principle ...
Page 120
... spring , and , lastly , into the rigors of a perpetual winter . XX . Results , if the equator of the earth were perpen- dicular to the ecliptic . - Were this the case , to a spec- tator at the equator , as the earth leaves the vernal ...
... spring , and , lastly , into the rigors of a perpetual winter . XX . Results , if the equator of the earth were perpen- dicular to the ecliptic . - Were this the case , to a spec- tator at the equator , as the earth leaves the vernal ...
Page 122
... vernal equinox along the equinoctial , the precession of the equinoxes increases the R. A. of the stars 50 " per year . On this account , star maps must be accompanied by the date of their calculations , that they may be corrected to ...
... vernal equinox along the equinoctial , the precession of the equinoxes increases the R. A. of the stars 50 " per year . On this account , star maps must be accompanied by the date of their calculations , that they may be corrected to ...
Page 123
... vernal equinox ; but since then the equinoxes have retrograded nearly a whole sign , so that now while the sun is in the sign Aries on the ecliptic , it corresponds to the constellation Pisces in the heavens . Pisces is therefore the ...
... vernal equinox ; but since then the equinoxes have retrograded nearly a whole sign , so that now while the sun is in the sign Aries on the ecliptic , it corresponds to the constellation Pisces in the heavens . Pisces is therefore the ...
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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